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Seiko Turtle Automatic Divers 200M Mens Watch
Ref. SRPE93K1
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Stepping up in the same dial colour
The Turtle's lineage runs back to the Seiko 6309 of the late 1970s, a cushion-cased diver that accumulated a devoted following over decades of hard use. This SRPE93K1 is its direct modern descendant, updated principally to bring the dial text into line with current ISO diving standards — the kind of change that marks a watch evolved rather than reinvented. The nickname was always going to stick: the rounded case shape, the domed profile and the sculpted caseback read unmistakably as a shell. The 45mm diameter is somewhat misleading. A lug-to-lug of 47.7mm is compact for a case this wide, and the inward-sloping cushion geometry keeps much of that footprint off the wrist — it wears closer to 42mm in practice. The crown sits at 4 o'clock, angled away from the knuckle, which matters on a watch you might actually wear in the water. The 4R36 is not Seiko's most refined movement, but it hacks, hand-winds and has proven itself across enough years and enough conditions that reliability is not in question. The accordion silicone strap — a Seiko design from 1975 — flexes with the compression a diver's wrist undergoes at depth, and the steel keeper rather than a plastic one suggests the rest of the watch's no-shortcuts approach to construction.
- Reference
- SRPE93K1
- Brand
- Seiko
- Collection
- ProspexCase Size: 45
- Case size
- 45mm
- Case thickness
- 13.4mm
- Lug width
- 22mm
- Case material
- Stainless steel
- Case shape
- Cushion
- Dial
- Black
- Crystal
- Hardlex
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- 4R36
- Functions
- Day-date
- Water resistance
- 200m
- Bracelet / strap
- Silicone strap
- Strap colour
- Black
- Clasp
- Buckle
- Lume
- LumiBrite
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 47.7mm
- Power reserve
- 41 hours
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.
Manufacturer’s guarantee
Best of 2 retailers
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
- Luminous hands and markers for low light
Worth knowing
- 45mm is a large watch with real presence
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SRPE93K1 |  RA-AA0003R39B |  98A178 |
|---|---|---|---|
| Price | £379 | £385 | £359 |
| Case size | 45mm | 41.8mm | 46mm |
| Water resistance | 200m | 200m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Silicone strap | Stainless steel bracelet | Stainless steel bracelet |
| Power reserve | 41 hours | 40 hours | — |
| This watch |
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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.
Will the glass scratch?
It resists most everyday knocks. Hardlex is a hardened mineral glass — tougher than standard mineral, softer than sapphire.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How 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.
What size strap does it take?
22mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
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.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Both Goldsmiths and F.Hinds list it at £379, so choose on delivery and warranty rather than price.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
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