Kensington Watches
Seiko 5 Sports SRE004K1 'Compact' Two Tone Bracelet Watch - W78107

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Seiko

Seiko 5 Sports SRE004K1 'Compact' Two Tone Bracelet Watch - W78107

Ref. SRE004K1

Among our 203 Seiko watchesThis watch£320
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Stepping up in the same dial colour

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

The Seiko 5 Sports line has always applied robust, tool-watch thinking to everyday wearability, and this 28mm variant answers a specific question: what happens when that brief meets a smaller wrist. The result is a watch that carries the full Seiko 5 credentials — screw-down caseback, automatic movement, genuine water resistance — in a case sized for wrists that the standard Sports models simply overwhelm. The 2R06 inside beats at 21,600 vibrations per hour with manual winding available, which means the wearer can top up the roughly 40-hour reserve without waiting for daily wear to do the work. The white sunray dial, with its minute-track border and two-tone LumiBrite hands, reads cleanly across different light conditions. At 11.2mm thick the watch sits flush rather than proud on a smaller wrist, and the two-tone bracelet — the kind of detail that might read as dated on a larger case — proportions naturally here.

Reference
SRE004K1
Brand
Seiko
Case size
28mm
Lug width
14mm
Case material
Two-tone
Dial
White
Crystal
Hardlex
Movement
Automatic
Calibre
2R06
Functions
Day-date
Water resistance
100m
Bracelet / strap
Stainless steel bracelet
Strap colour
Two-tone
Clasp
Three-fold clasp
Lume
Luminous
Retailer
F.Hinds
Additional specifications
Power reserve
40 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

Also in 6 collections

This watch appears in Back in Stock (5,420), Watches Under 37mm (1,891), Automatic Watches (1,862), Women's Watches (1,818), Two-Tone Watches (538) 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
  • 28mm wears small and slips under any cuff
  • Luminous hands and markers for low light
  • Sits in the lower half of Seiko's range as we list it

Worth knowing

  • 40-hour reserve means winding it after a day off
Best forSwimmingSmall wristsEveryday wear

Seiko 5 Sports SRE004K1 'Compact' alternatives

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

5 Sports SRE004K1 'Compact' Two Tone Bracelet Watch - W78107 compared with 2 alternatives from other brands
SpecificationThis watch5 Sports SRE004K1 'Compact' Two Tone Bracelet Watch - W78107SRE004K1TissotSRV 22mm x 30mm Mother Of Pearl Ladies WatchT1601102111300FossilME3272 Carraway Automatic Brown Leather Strap Watch - W10456ME3272
Price£320£400£239
Case size28mm30mm30mm
Water resistance100m50m50m
MovementAutomaticAutomaticAutomatic
StrapStainless steel braceletStainless steel braceletLeather strap
Power reserve40 hours——
This watch
  • Costs more
  • Rated shallower
  • Costs less
  • Rated shallower

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 explained

Will 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 compared

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

How long does it run for when it's not worn?

About 40 hours fully wound — enough to survive a night off the wrist, but not a full weekend.

What size strap does it take?

14mm. 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.

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

Listed as women's.

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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