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Seiko 5 Sports SSK023K1 Field 'Deploy' Mechanical GMT Watch - W24226
Ref. SSK023K1
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The Field series began as Seiko's take on the tool-watch brief that military-style dialling has always set: legible under stress, worn without thought, built to keep going. Adding a GMT complication to that template is a straightforward upgrade in theory and a more considered one in practice, because it asks a 4R34 — Seiko's in-house automatic, made in Japan, with hacking seconds and manual winding — to do dual-zone work in a case that stays at 39.4mm and a lug-to-lug of 47.9mm. At that footprint the watch disappears on the wrist in the best sense, though the 13.6mm height means it reads as a working tool rather than a slim dresser. The matte-grained black dial and applied Arabic numerals are very much the Field aesthetic: no ambiguity, nothing decorative that does not also tell you something. The red five-sided GMT hand stands apart from the hour and minute hands cleanly enough that a time-zone check takes a glance rather than a study, and LumiBrite covers the hands, indices and GMT tip generously enough that the same is true in the dark. The five-link bracelet has more presence than the watch's proportions might suggest, and clasp adjustment runs through both push-pins and the holes machined into the clasp body itself — useful when a watch of 147 grams is going on and off over layers.
- Reference
- SSK023K1
- Brand
- Seiko
- Collection
- 5 Sports
- Case size
- 39.4mm
- Case thickness
- 13.6mm
- Lug width
- 20mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Hardlex
- Movement
- Automatic
- Calibre
- 4R34
- Functions
- GMT, Date
- Water resistance
- 100m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- LumiBrite
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 47.9mm
- Power reserve
- 41 hours
- Origin
- Made in Japan
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 5 Sports range (13), Back in Stock (5,420), Stainless Steel Watches (3,525), Automatic Watches (1,862), Sports Watches (847), Automatic Watches Under £500 (385) and GMT Watches (266).
Manufacturer’s guarantee
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 39.4mm suits most wrists
- Luminous hands and markers for low light
- Second time zone for travelling
Seiko 5 Sports SSK023K1 Field alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SSK023K1 | 1645B16 | MTTS1F501 |
|---|---|---|---|
| Price | £410 | £405 | £400 |
| Case size | 39.4mm | 40.5mm | 41mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Leather strap |
| Power reserve | 41 hours | 41 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 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.
What size strap does it take?
20mm. 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 47.9mm, 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 wristIs it a men's or women's watch?
Listed as men's, though at 39.4mm it sits in the range that suits anyone.
Cheapest 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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