Kensington Watches
Seiko 5 Sports SRE021K1 SNXS 'Denim Blue' Bracelet Watch - W25533

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Seiko

Seiko 5 Sports SRE021K1 SNXS 'Denim Blue' Bracelet Watch - W25533

Ref. SRE021K1

Among our 203 Seiko watchesThis watch£330
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Stepping up in the same dial colour

Price range £110 to £3,550 across 203 Seiko watches in stock.

The SNXS line earns its nickname from the case shape alone: a helmet-like tonneau that Seiko's fans have long called Hebitama — snake swallowing an egg — for the way the lugs curve up and over the dial. This revival keeps that silhouette intact but pulls the case in to 32mm, making it one of the more honestly compact automatics in the current Seiko 5 Sports range rather than a standard case dressed down. At 38.7mm lug to lug, it sits flush on narrower wrists in a way that larger sports watches rarely manage, and the sunray blue dial — shot through with gold-tone markers — shifts noticeably between direct light and shade. The bracelet uses push-pins for sizing rather than the usual spring-bar arrangement, which makes adjustments quicker and more precise at home. The 2R06 inside is Japanese-made and hacks, winds manually, and carries a 40-hour reserve: not the most decorated calibre in Seiko's catalogue, but built for daily use without ceremony, which is what this watch is for.

Reference
SRE021K1
Brand
Seiko
Case size
38.7mm
Case material
Stainless steel
Dial
Blue
Movement
Automatic
Calibre
2R06
Functions
Day-date
Water resistance
100m
Bracelet / strap
Stainless steel bracelet
Strap colour
Silver
Clasp
Three-fold clasp
Lume
Luminous
Retailer
F.Hinds
Additional specifications
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.

All Seiko watches

Also in 6 collections

This watch appears in Back in Stock (5,420), Stainless Steel Watches (3,525), Automatic Watches (1,862), Women's Watches (1,818), Blue Dial Watches (982) and Automatic Watches Under £500 (385).

Manufacturer’s guarantee

What the specifications mean

A mechanical watch for everyday wear.

Strengths

  • 100m water resistance covers swimming and watersports
  • 38.7mm 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

Price history

This watch is currently at its highest recorded price. It was £310 on 27 August. Prices are checked every day, and we record any changes.

£330£33027 August

Seiko 5 Sports SRE021K1 SNXS alternatives

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

5 Sports SRE021K1 SNXS 'Denim Blue' Bracelet Watch - W25533 compared with 2 alternatives from other brands
SpecificationThis watch5 Sports SRE021K1 SNXS 'Denim Blue' Bracelet Watch - W25533SRE021K1TissotPRX Digital 40mm Unisex Watch GreyT1374631103000CasioEdifice EFK-100CD-1AER Automatic Bracelet Watch - W17544EFK-100CD-1AER
Price£330£330£289
Case size38.7mm40mm39mm
Water resistance100m100m100m
MovementAutomaticAutomaticAutomatic
StrapStainless steel braceletStainless steel braceletStainless steel bracelet
Power reserve——40 hours
This watchClosely matched
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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 explained

Does 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 compared

Is it a men's or women's watch?

Listed as women's, though at 38.7mm 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.

Has the price changed recently?

It's currently at its highest recorded price. It's ranged between £310 and £330, today it's £330.

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