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Seiko Prospex SRPK01K1 'Great Blue' Turtle Scuba Diver's Watch - Special Edition - W25417
Ref. SRPK01K1
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The Turtle name came from Seiko enthusiasts who noticed the cushion-shaped case's resemblance to a shell, and this edition extends a long-running partnership with PADI into what is arguably its most considered expression yet. The textured blue dial is a deliberate attempt to render the view looking upward from depth — light breaking and scattering across the ocean surface — and at 45mm it carries enough presence for that idea to land without feeling theatrical. A ceramic bezel insert in the same palette aids readability in low visibility, and the Great Wave motif engraved on the caseback, drawn from Hokusai, quietly continues the oceanic theme somewhere the wearer keeps to themselves. At 13.2mm thick it is not a slim watch, but for something rated to professional diving standards under ISO 6425 certification, it sits closer to a dress watch's profile than the category usually allows, and the lug-to-lug of 47.7mm means it tracks the wrist rather than bridging it. The bracelet carries a diver's extension built into the clasp, which matters when the watch is worn over a wetsuit rather than adjusted as an afterthought. A portion of proceeds from sales goes to PADI's Ocean Cleanup campaign, which makes the collaboration something more than a co-branding exercise.
- Reference
- SRPK01K1
- Brand
- Seiko
- Collection
- Prospex
- Case size
- 45mm
- Case thickness
- 13.2mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Blue
- Crystal
- Sapphire
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- 4R36
- Functions
- Day-date
- Water resistance
- 200m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- LumiBrite
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 47.7mm
- Power reserve
- 41 hours
- Weight
- 188g
Learn more about Seiko
Kintaro Hattori opened a watch and clock shop in Tokyo in 1881, aged twenty-one, and began manufacturing under the name Seikosha — roughly, house of exquisite workmanship — in 1892. The Seiko name appeared on watches from 1924.
The company's significance is that it broke the Swiss monopoly twice. First on precision: Seiko was appointed official timekeeper of the 1964 Tokyo Olympics and built the quartz chronometers and printing timers to do it, and in the 1960s its movements placed highly at the Neuchâtel and Geneva observatory trials against the best Swiss houses.
Then on technology. On Christmas Day 1969 Seiko released the Astron, the world's first quartz wristwatch, accurate to five seconds a month where mechanical watches managed that per day. The consequences for Switzerland were catastrophic — employment in the Swiss industry fell by roughly two-thirds over the following decade. Seiko deliberately did not enforce its quartz patents, allowing the technology to spread.
The same year it produced the 6139, among the first automatic chronographs, and it has since introduced Kinetic, Spring Drive — a hybrid regulating a mechanical mainspring electronically, giving a perfectly gliding seconds hand — and its own dive and field lines.
Seiko remains fully vertically integrated, making its own hairsprings, quartz crystals, and even the Zaratsu-polished cases, at price points from under a hundred pounds upward.
- 1881
- Kintaro Hattori opens his Tokyo shop.
- 1924
- The first watches carry the Seiko name.
- 1964
- Official timekeeper of the Tokyo Olympics.
- 1969
- The Astron becomes the first quartz wristwatch.
- 1999
- Spring Drive enters production.
Also in 7 collections
This watch appears in the Seiko Prospex range (32), Back in Stock (3,460), Stainless Steel Watches (2,531), Automatic Watches (1,573), Blue Dial Watches (701), Sports Watches (696) and Watches 44mm and Over (569).
Manufacturer’s guarantee
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- 47.7mm lug-to-lug keeps the 45mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Worth knowing
- 45mm is a large watch with real presence
Seiko Prospex SRPK01K1 'Great Blue' alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SRPK01K1 | GM-B2100BD-1AER | 98A302 |
|---|---|---|---|
| Price | £570 | £549 | £449 |
| Case size | 45mm | 44mm | 45mm |
| Water resistance | 200m | 200m | 200m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 41 hours | — | 42 hours |
| This watch | Closely matched |
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 200m it is rated for swimming, snorkelling and recreational diving.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 41 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
Will it fit my wrist?
Lug-to-lug is 47.7mm, which suits wrists from roughly 16.5cm (6½ inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristCheapest place to buy
F.Hinds is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
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