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Few dive watches have a shape as recognizable as the Turtle, and the Seiko Prospex version is a deliberate return to it. The Prospex collection presents the watch as a recreation of the 1970 predecessor of the “turtle”, and Seiko says an original model has been redesigned for modern diving use. This seiko prospex turtle review tests that claim against published specifications and cited reporting.
The 1970 original and its recreation
The original 1970 model was water resistant to 150 m, with its crown at 4 o’clock, protected by the large case. That crown placement is a large part of why the shape is linked to the nickname. The recreation is slightly larger than the original, but Seiko says it stays faithful to the 1970 aesthetic while incorporating advanced technologies. The SLA033 is a limited-edition recreation of the 1970 automatic dive watch.
Worn & Wound dates the Turtle’s story to 1976 and the reference 6306-7000/1, released for the Japanese market only and rated to 150 meters. It also reports that Seiko relaunched the Turtle in 2016 as part of the Prospex series after a period of dormancy. Note that the 1970 design date comes from Seiko, while the 1976 reference date comes from Worn & Wound; the two sources frame the history differently.
How this review works
Eva Watches did not carry out the testing here. Comments on how the watch behaves in use come from the publications cited, and each is credited to its source. Specifications and history come from Seiko and from published reporting. Worn & Wound, for one, describes the Turtle as Seiko’s highly functional tool watch for the common man, and says Seiko has a long history of making superior dive watches for a wide audience.
The sections that follow cover design, movement, wearability and practical trade-offs. Where a detail is not published, the text says so plainly.
Verdict in Brief
Verdict in Brief
Choose the Turtle for its dive-ready specifications, and choose the reference with care. This seiko prospex turtle review opens with the sourced case for and against, because the watch is not a single product. Worn & Wound calls it Seiko’s highly functional tool watch for the common man. The details below show where that description holds and where it needs a caveat.
The case for it
- 200 m water resistance: Seiko lists the SLA033 as water resistant to 200 m, with an anti-scratch coating and a domed sapphire crystal with anti-reflective treatment. Hodinkee states the same 200 m figure for the SRP775 and SRP777. The original 1970 model was water resistant to 150 m, so the modern rating is a step up.
- Movements matched to the model: Hodinkee identifies the SRP movement as Seiko caliber 4R36, an automatic with hand-winding and stop-seconds, running in 24 jewels at 21,600 vph. The SLA033 uses caliber 8L35, which Seiko describes as designed for dive watches.
- A considered update: Seiko says the recreation is slightly larger than the original but stays faithful to the 1970 aesthetic while incorporating advanced technologies.
The trade-offs
- Size: Hodinkee gives the SRP775 and SRP777 as 44.3 mm x 14 mm stainless steel cushion cases. Seiko lists the SLA033 at 45.0 mm in diameter and 13.0 mm thick. Both are substantial, so try one on a wrist before committing.
- Several watches under one name: The SLA033 is a limited edition recreation of the 1970 automatic dive watch, produced in 2,500 pieces worldwide. It sits apart from the SRP models, and the calibers differ, as noted above. Confirm the exact reference before buying.
What one reviewer reported
Hodinkee’s author describes the SRP775 bezel as turning smoothly but slightly stiff, with crisp detents. The article also notes early complaints about bezel alignment but says the author’s examples showed no such problems. The same piece says the lume glows very brightly, that the watch can be hand-wound and has a stop-seconds feature, and that the author’s SRP775 loses exactly two seconds a day with negligible variation. That is one example, not a guarantee for every Turtle. Service intervals and resale values are not covered by the sources used here, so this verdict leaves them aside.
Design and Build: The Cushion Case That Defined the Turtle
Start with the numbers and the outline makes sense. The original 1970 model was water resistant to 150 m, and its crown sat at 4 o’clock, protected by the large case. That arrangement, an oblong, softly curving case resembling a turtle shell when viewed from above, gave the model its nickname. Every modern Turtle re-creation starts from that case.
Where the design comes from
Worn & Wound dates the Turtle’s story to 1976 and the reference 6306-7000/1, released for the Japanese market only. It carried a 150 m depth rating, the 6306A caliber and a black dial with oversized lume plots. The 6309-7040/9 is essentially its worldwide version, with minimal differences. Its 6309A caliber has a lower jewel count than the 6306A and lacks hacking seconds.
Seiko relaunched the Turtle in 2016 within the Prospex series after a period of dormancy. On the SRP models the ‘Water Resist’ 150 meters dial designation gives way to the Prospex logo, signaling an upgraded rating of 200 meters. Their handsets and dial elements are nearly identical to the 6309. Seiko describes the later Prospex recreation as slightly larger than the original but faithful to the 1970 aesthetic.
Case dimensions compared
| Reference | Case | Source |
|---|---|---|
| SRP775 / SRP777 | 44.3 mm x 14 mm, stainless steel cushion case | Hodinkee |
| SLA033 | 45.0 mm diameter, 13.0 mm thick | Seiko |
The SLA033 is wider by less than a millimeter but about a millimeter slimmer. Published SRP figures vary by source: Worn & Wound lists the SRP case size as 45mm, while Hodinkee cites 44 mm for the SRP775 in one place and 44.3 mm in another. The more precise 44.3 mm is the figure to trust.
How the modern cases are built
Hodinkee lists the SRP775 and SRP777 as water resistant to 200 m. Seiko publishes a fuller specification for the SLA033, a limited-edition recreation of the 1970 automatic dive watch:
- Stainless steel case with an anti-scratch coating
- Screw-down caseback and crown
- Water resistance of 200 m
- Domed sapphire crystal with anti-reflective treatment
- Outer bezel edge polished with the Zaratsu technique for a mirror finish
- Magnetic resistance of 4,800 A/m
For the SRP models, no equivalent list of coating, crystal or finishing details is given in the material available, so the SLA033’s specification should not be assumed to carry over.
The SLA033 is fitted on an ultra-durable silicone strap and hand-assembled at the Watch Studio in Shizukuishi, northern Japan. Among the SRP pair, Hodinkee reports the SRP775 on a bracelet and the SRP777 on a silicone rubber strap. Both have Lumibrite hands and markers. The SRP775 adds gold accents on dial, bezel and hands, while the SRP777 looks more subdued.
A note on the durability story
Seiko notes that Naomi Uemura tested the watch’s durability on his 18-month solo sled dog journey from Greenland to Alaska, covering 12,000 kilometres. That belongs to the original’s reputation, not to the modern cases. For those, the relevant evidence is the stated construction and the 200 m rating.
Movement and Performance: 8L35, 4R36, and the Mini-Turtle Base
Three calibers, one nickname. Anyone reading a seiko prospex turtle review should know that the word “Turtle” says little about what is ticking inside, because the movement depends on the reference. The table below sets out what is documented for each watch discussed here, and the notes after it explain what those entries mean in daily use.
| Reference | Caliber | What is documented |
|---|---|---|
| SLA033 | 8L35, designed for dive watches | Automatic |
| SRP775 | 4R36 | Automatic, hand-winding, stop-seconds, 24 jewels, 21,600 vph |
| 6306-7000/1 (vintage) | 6306A | Not detailed in the available material |
| 6309-7040/9 (vintage) | 6309A, with a lower jewel count than the 6306A | No hacking seconds |
SLA033: the 8L35
Seiko Watch Corporation states that the SLA033 is powered by caliber 8L35, designed for dive watches, and that the movement is automatic. Beyond that, Seiko’s material for the watch does not publish an accuracy figure, a power reserve or a service interval. Treat the caliber name as an identification, not a performance promise, and ask Seiko or an authorized retailer if those numbers matter to your purchase.
SRP775 and its family: the 4R36
Hodinkee identifies the SRP775 movement as Seiko caliber 4R36: automatic, with hand-winding and stop-seconds, 24 jewels, running at 21,600 vibrations per hour. In practice, that means the watch can be wound by hand and the seconds hand can be stopped while you set the time. Those functions are documented for the SRP775; extending them to every Turtle variant would go beyond what the sources say.
Worn & Wound describes the SRP series as using an in-house Seiko caliber updated with modern components for improved performance longevity.
The vintage references
The older watches were not uniform either. The 6306-7000/1 was powered by the 6306A. The 6309-7040/9 uses the 6309A, which has a lower jewel count than the 6306A and lacks hacking seconds. The 4R36 documented for the SRP775 does have stop-seconds. For a collector coming from a 6309A watch, that is a practical difference in setting the time.
Accuracy and the Mini-Turtle
The Hodinkee author reports that his SRP775 loses exactly two seconds a day with negligible variation. That is a single owner’s result on a single watch, and Seiko does not publish an accuracy rating for the 4R36 in the material available, so it should not be read as a spec.
The Mini-Turtle is said to share a base movement with the larger Turtles. Further Mini-Turtle technical detail and long-term service-interval data for the 8L35 or 4R36 are not published, so confirm those points with Seiko or an authorized retailer before buying.
Alternatives: SLA033, SRP Turtle, and Mini-Turtle
The Turtle name now covers several quite different watches, and the facts that separate them are concrete: case dimensions, the movement inside, where each sits in the model’s history, and what the maker documents. This section sets the SLA033, the SRP775 and SRP777 pair, and the Mini-Turtle side by side on those points, which is the most useful frame for any seiko prospex turtle review comparison.
Where each one sits in the Turtle story
Seiko says the original 1970 model was water resistant to 150 m and had its crown at 4 o’clock, protected by the large case. Worn & Wound starts the Turtle’s story in 1976 with the reference 6306-7000/1, released for the Japanese market only and rated to 150 meters. It adds that Seiko relaunched the Turtle in 2016 as part of the Prospex series after a period of dormancy.
The SLA033 is the closest to the beginning. Seiko calls it a limited edition recreation of the 1970 automatic dive watch, slightly larger than the original but faithful to its aesthetic. The SRP models belong to the Prospex relaunch era, and Worn & Wound notes that the SRP series replaces the old ‘Water Resist’ 150 meters dial wording with the Prospex logo, signaling a 200 meter rating.
The figures side by side
| Family or reference | Case size | Movement | Water resistance | Other documented equipment |
|---|---|---|---|---|
| SLA033 | 45.0 mm diameter, 13.0 mm thick | Caliber 8L35, designed for dive watches | 200 m | Domed sapphire crystal with anti-reflective treatment; silicone strap |
| SRP775 / SRP777 | 44.3 mm x 14 mm, stainless steel cushion case | Caliber 4R36, automatic with hand-winding and stop-seconds, 24 jewels, 21,600 vph | 200 m | SRP775 on a bracelet, SRP777 on a silicone rubber strap; crystal material not given in the cited figures |
| Mini-Turtle | 42.3 mm | Same base movement as the larger Turtle models | Not published in the figures cited here | Not published in the figures cited here |
SLA033: the most fully documented
Of the three families, the SLA033 comes with the longest list of specifications from the maker. Seiko lists the 8L35, a domed sapphire crystal with anti-reflective treatment, a stainless steel case with anti-scratch coating, and a screw-down caseback and crown. Magnetic resistance is given as 4,800 A/m. The outer edge of the bezel is Zaratsu polished for a mirror finish, and the watch is hand-assembled at the Watch Studio in Shizukuishi, northern Japan.
The trade-off is supply. It is a limited edition of 2,500 pieces worldwide, announced for sale from July 2019, so it is a collector’s purchase rather than a current catalog staple. Its 45.0 mm diameter and 13.0 mm thickness make it the widest of the three, but also the thinnest of the full-size pair.
SRP775 and SRP777: the standard-production pair
These two share a 44.3 mm x 14 mm case and the 4R36. The difference is the strap: bracelet on the SRP775, silicone rubber on the SRP777. Against the SLA033 they are 0.7 mm narrower in diameter and 1 mm thicker, going by the published dimensions. The Hodinkee figures do not state a crystal material, so confirm that with the seller for the specific watch. These suit a buyer who wants the full-size Turtle shape in a regular-production format and cares about the choice between bracelet and rubber.
Mini-Turtle: the compact case
The Mini-Turtle measures 42.3 mm, about 2 mm less than the 44.3 mm SRP cases, and it shares the same base movement as the larger Turtles. Water resistance, crystal and strap are not given in the figures cited here, so check them before buying. The documented advantage is the smaller diameter.
Choosing between them
- SLA033: for the 8L35, a documented sapphire crystal and the nearest link to the 1970 original.
- SRP775 or SRP777: for the 4R36 in a standard-production case, on bracelet or silicone.
- Mini-Turtle: for a case about 2 mm smaller than the SRP pair.
SRPE93, King Turtle references, PADI variants, SPB315, SPB317, SPB333, SPB359 and the 6R35 are left out, as no verified specifications for them are available.
Pros and Cons
The Turtle makes a strong case on paper, and a few points deserve a close look before you commit. The assessment below follows Seiko’s published figures for the SLA033 alongside Hodinkee’s reporting on the SRP775 and SRP777, which is the basis for this seiko prospex turtle review. The two groups of watches are not identical, so each point is tied to the reference it describes.
What speaks in its favor
- A faithful recreation with updated engineering. Seiko presents the Prospex SLA033 as a recreation of the 1970 predecessor of the Turtle. It is slightly larger than the original, yet Seiko says it stays faithful to the 1970 aesthetic while incorporating advanced technologies.
- A higher water resistance rating than the original. Seiko lists 200 m for the SLA033, and Hodinkee gives the same figure for the SRP775 and SRP777. The 1970 original was water resistant to 150 m.
- Construction that suits a dive watch. Seiko specifies a screw-down caseback and crown, a stainless steel case with an anti-scratch coating, and a domed sapphire crystal with anti-reflective treatment.
- An easy-to-live-with movement on the SRP775. Hodinkee identifies Seiko caliber 4R36 as automatic, with hand-winding and stop-seconds, running in 24 jewels at 21,600 vph. Hand-winding and stop-seconds make starting and setting the watch more straightforward.
- Strong lume. Hodinkee says the lume glows very brightly and notes Lumibrite hands and markers.
- A pleasant bezel. The same author describes a bezel that turns smoothly, if slightly stiff, and hits its detents crisply.
- One encouraging timekeeping report. Hodinkee’s author says his SRP775 loses exactly two seconds a day with negligible variation. That is a single example, not a guarantee.
What to weigh against it
- Size. Hodinkee lists the SRP775 and SRP777 at 44.3 mm x 14 mm, and Seiko gives the SLA033 as 45.0 mm in diameter and 13.0 mm thick. These are large watches, so smaller wrists call for a careful fit check. Lug-to-lug length is not among the published figures, and it is the measurement that most affects how a watch sits on the wrist.
- Bezel alignment. Hodinkee notes early complaints about bezel alignment, but says the examples it handled showed no such problems.
- Limited supply of the SLA033. Seiko describes it as a limited edition recreation of the 1970 automatic dive watch, made in 2,500 pieces worldwide. It is not a regular catalog purchase.
- Open questions. Seiko and Hodinkee do not address long-term service needs or how values hold up over time. Treat both as unknown rather than assuming every Turtle reference behaves like the SLA033.
Where to Buy
This page does not point to a specific retailer or listing. No matched products are available for this section, so there is no shop to recommend. What follows is a short checklist built from what Seiko itself publishes, which is more useful when you compare sellers.
What Seiko says about the watch
The model discussed here is SLA033, a limited edition recreation of the 1970 automatic dive watch. Seiko states that it is produced as a limited edition of 2,500 pieces worldwide. It was to be sold from July 2019 in Seiko boutiques and main Seiko retailers. Seiko does not publish current pricing or stock in the material available here, and both will vary by seller and market.
Details to confirm before you buy
- Reference: SLA033 is the reference tied to the limited edition recreation. A listing that gives a different reference is a different watch.
- Movement: The watch is automatic and uses caliber 8L35, designed for dive watches.
- Case and water resistance: Seiko lists a stainless steel case with an anti-scratch coating and water resistance of 200 m. The original 1970 model was rated to 150 m, so the two should not be confused.
- Crystal: A domed sapphire crystal with anti-reflective treatment.
- Caseback and crown: Both are screw-down.
- Strap: An ultra-durable silicone strap.
- Size: The recreation is slightly larger than the original. Check the seller’s stated dimensions against your wrist.
Sourcing and authenticity
Seiko’s own sales channel for this edition was its boutiques and main retailers. A buyer who goes elsewhere should ask the seller to confirm the reference and the authorized-retailer status. The edition is limited to 2,500 pieces, so a listing that implies unlimited supply deserves a second look. Seiko publishes no pricing for the edition in the material here, so any price you see should be checked against the seller’s own terms.
Frequently Asked Questions
How does the modern Prospex Turtle compare with the 1970 original in size and features?
The modern Prospex recreation is slightly larger while retaining the 1970 watch’s cushion-case design and 4 o’clock crown position. The original was rated to 150 m, whereas the documented modern recreation is rated to 200 m and adds a scratch-resistant case, domed sapphire crystal with anti-reflective treatment, and a Zaratsu-polished bezel edge. The modern model uses automatic caliber 8L35.
Which Turtle models are limited editions, and how many pieces were produced?
The SLA033 is documented as a limited-edition recreation of the 1970 automatic dive watch. Seiko specified a worldwide production of 2,500 pieces, with sales scheduled to begin in July 2019 through Seiko boutiques and main Seiko retailers. The available facts do not establish production numbers for the SRP models, the Mini-Turtle, or other later Turtle variants, so their edition status should be checked against the exact reference and Seiko’s documentation.
What movements power the different Turtle recreations, and what functions do they provide?
The SLA033 uses automatic caliber 8L35, which Seiko describes as designed for dive watches. The SRP775 and SRP777 use automatic caliber 4R36, with hand-winding and a stop-seconds function; the cited documentation also gives 24 jewels and a 21,600 vph frequency. The Mini-Turtle is reported to use the same base movement as the larger Turtle models. A power-reserve figure is not documented in the available facts.
What water resistance and durability features are documented for the modern re-creations?
The SLA033 is documented with 200 m water resistance, a stainless-steel case with an anti-scratch coating, a screw-down crown and caseback, and magnetic resistance of 4,800 A/m. Its domed sapphire crystal has anti-reflective treatment, and its bezel edge receives a Zaratsu mirror finish. The SRP775 and SRP777 are also documented at 200 m, with stainless-steel cushion cases and Lumibrite hands and markers.
How do the SRP Turtle and Mini-Turtle differ in case size and movement?
The documented SRP775 and SRP777 measure 44.3 mm by 14 mm, while the Mini-Turtle measures 42.3 mm—about 2 mm smaller than the SRP777 and related models. The Mini-Turtle uses the same base movement as the larger Turtle models, so the principal documented distinction is case size rather than a separately identified caliber. Check the exact reference for its detailed movement specification and equipment.
Final Verdict: Who Should Buy the Seiko Prospex Turtle?
The larger SRP-style Turtle is the clearest choice for readers who value the historic cushion-case silhouette and a practical dive-watch specification. The documented SRP775 and SRP777 variants measure 44.3 mm by 14 mm, are water resistant to 200 m, and use Seiko’s 4R36 automatic movement with hand-winding and stop-seconds functions. That combination makes a strong case for the design, provided those dimensions suit your wrist and you do not need a compact watch.
The Mini-Turtle points in the more sensible direction for buyers who want the same family resemblance in a smaller case: the documented diameter is 42.3 mm, around 2 mm less than the larger models. Its exact movement, water-resistance rating, and other specifications should still be confirmed for the specific variant before purchase.
The SLA033 is best understood as a historically focused limited edition rather than a general recommendation. It combines the 8L35 automatic caliber, sapphire crystal, anti-scratch case treatment, and 200 m water resistance, and Seiko limited production to 2,500 pieces worldwide. Those documented features describe the watch without making an unsupported price or value judgment.
This review should not be treated as a blanket recommendation for readers seeking exact regional pricing, proven long-term service data, or a particular King Turtle, PADI, SRPE93, or SPB specification not covered by the evidence. It is a source-backed review of documented variants—not a claim that Eva Watches personally tested every Turtle.
