Kensington Watches
Seiko 5 Sports SRPJ81K1 'In The Metal' Midfield Sports Watch - W24219

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Seiko

Seiko 5 Sports SRPJ81K1 'In The Metal' Midfield Sports Watch - W24219

Ref. SRPJ81K1

Among our 178 Seiko watchesThis watch£260
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Stepping up in the same colour and case shape

Price range £110 to £3,550 across 178 Seiko watches in stock.

The Midfield series exists as a deliberate step back from the 39.4mm SRPG field watches that preceded it — a return to the proportions that defined mid-century military field watches before case sizes drifted upward. At 36.4mm with a lug-to-lug of just 44.4mm and strongly curved lugs, it will sit flush against almost any wrist, and the compactness reads as considered rather than compromised. The 4R36 inside is the dependable core of Seiko's automatic catalogue: hand-windable, hackable, and proven across decades of production. Arabic numerals with a heavy coat of LumiBrite give the black dial a utilitarian clarity that holds through the night, while the red-tipped seconds hand adds the single note of colour a field watch of this type traditionally carries. Clasp micro-adjustment holes and push-pin link removal mean the bracelet can be set to fit precisely, which on a watch this size makes a noticeable difference to how it wears.

Reference
SRPJ81K1
Brand
Seiko
Collection
5 SportsCase Size: 36
Case size
36.4mm
Case thickness
12.5mm
Lug width
18mm
Case material
Stainless steel
Case shape
Round
Dial
Black
Crystal
Hardlex
Movement
Automatic
Calibre
4R36
Functions
Day-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
44.4mm
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.

All Seiko watches

Manufacturer’s guarantee

What the specifications mean

A mechanical watch for everyday wear.

Strengths

  • 100m water resistance covers swimming and watersports
  • 36.4mm suits most wrists
  • Luminous hands and markers for low light
  • Sits in the lower half of Seiko's range as we list it
Best forSwimmingEveryday wear

Compare alternatives

Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.

5 Sports SRPJ81K1 'In The Metal' Midfield Sports Watch - W24219 compared with 2 alternatives from other brands
SpecificationThis watch5 Sports SRPJ81K1 'In The Metal' Midfield Sports Watch - W24219SRPJ81K1CasioEdifice EFK-200D-4AER Auto Red Electroform Dial Bracelet Watch - W17598EFK-200D-4AERTissotPRX Digital 40mm Unisex Watch GreyT1374631103000
Price£260£290£265
Case size36.4mm38mm40mm
Water resistance100m100m100m
MovementAutomaticAutomaticAutomatic
StrapStainless steel braceletStainless steel braceletStainless steel bracelet
Power reserve41 hours42 hours
This watch
  • Wears larger
  • Wears larger

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.

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?

18mm. 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 44.4mm, which suits wrists from roughly 16cm (6¼ 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, though at 36.4mm 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.

Who are F.Hinds?

F.Hinds has been run by the same family since 1856 and is now in its fifth generation, with more than 115 shops across England and Wales. They are a member of the Responsible Jewellery Council and an Authorised Diamond Dealer.

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