
Tap the image to enlarge

Seiko 5 Sports SRPK05K1 Men's Watch – 42.5mm Black Dial Stainless Steel
Ref. SRPK05K1
See more premium optionsHide
Stepping up in the same colour and case shape
5 Sports HDB006K1 Automatic Sports Field Bracelet Watch - W25559£370
Coutura SSB443P1 Black IP Chronograph Bracelet Watch - W25427£379
5 Sports SRPL85K1 SKX Redux Bracelet Watch - W25511£390
5 Sports SSK023K1 Field 'Deploy' Mechanical GMT Watch - W24226£410
Prospex SNJ025P1 'Arnie' Black Strap Diver's Watch - W25180£420
The SRPK05K1 sits at 42.5mm with a case thickness of 13.4mm — a proportionally chunky build that wears with some presence on the wrist. The black dial carries orange accents across the hands and markers, creating a sports-oriented contrast against the silver stainless steel case and bracelet. A unidirectional rotating bezel reinforces the tool-watch character, while Hardlex crystal provides everyday protection above the dial. The caseback is exhibition, exposing the 4R36 automatic movement beneath — a 24-jewel calibre beating at 21,600 vph with a 41-hour power reserve. The three-fold clasp closes the stainless bracelet securely, and water resistance reaches 100 metres.
- Reference
- SRPK05K1
- Brand
- Seiko
- Case size
- 42.5mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Hardlex
- Bezel
- Unidirectional rotating
- Movement
- Automatic
- Calibre
- 4R36
- Functions
- Date
- Water resistance
- 100m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- Luminous
- Retailer
- Watch Enclave
Additional specifications
- 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.
Also in 4 collections
This watch appears in Back in Stock (4,815), Stainless Steel Watches (3,155), Automatic Watches (1,641) and Automatic Watches Under £500 (375).
International shipping available
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- Luminous hands and markers for low light
- Sits in the lower half of Seiko's range as we list it
Seiko 5 Sports SRPK05K1 alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SRPK05K1 | R8821108036 | RGS10006/01 |
|---|---|---|---|
| Price | £299 | £299 | £299 |
| Case size | 42.5mm | 43mm | 43mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Leather strap | Leather strap |
| Power reserve | 41 hours | — | — |
| This watch | Closely matched | Closely matched |
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 100m it is rated for swimming and snorkelling, though not for diving.
Water resistance explainedWill the glass scratch?
It resists most everyday knocks. Hardlex is a hardened mineral glass — tougher than standard mineral, softer than sapphire.
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.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Watch Enclave is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
More Seiko watches like the 5 Sports SRPK05K1
In stock, and close on style and price









