Kensington Watches
Seiko Prospex Speedtimer 6R 'Compact Countdown' 39.5mm Mens Watch Grey-White Dial

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Seiko

Seiko Prospex Speedtimer 6R 'Compact Countdown' 39.5mm Mens Watch Grey-White Dial

Ref. SPB513J1

Among our 151 Seiko watchesThis watch£900
Premium

Sits in Seiko’s upper tier here — more premium than three quarters of the Seiko watches we list, which start at £126.

Price range £126 to £3,550 across 151 Seiko watches in stock.

The Speedtimer name goes back to 1969, when Seiko produced one of the earliest automatic chronographs. This version marks a significant departure from that lineage: it is the first Speedtimer to run on the 6R automatic calibre rather than a dedicated chronograph movement, and with it comes a countdown bezel function in place of the elapsed-time mechanism. The case shape itself is a quiet piece of history — the flowing lines were first cut for the 1972 reference that collectors call the Panda. At 39.5mm with an 11.95mm depth, this sits unusually flat for a Prospex rated to 200 metres, slim enough to pass under a shirt cuff without catching. The silver-white dial keeps legibility simple, and the LumiBrite triangle on the inner ring means the countdown reference point remains readable once the light drops — a practical detail for anyone using the function rather than admiring it.

Reference
SPB513J1
Brand
Seiko
Collection
Speedtimer
Case size
39.5mm
Case shape
Round
Dial
White
Crystal
Sapphire
Movement
Automatic
Functions
Countdown timer
Water resistance
200m
Lume
LumiBrite
Retailer
Mappin & Webb
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 4 collections

This watch appears in the Seiko Speedtimer range (16), Automatic Watches (1,573), Sports Watches (696) and Dive Watches (499).

What the specifications mean

A mechanical watch built to be worn hard and got wet.

Strengths

  • 200m water resistance, rated for actual diving
  • 39.5mm suits most wrists
  • Sapphire crystal, which resists scratching
  • Luminous hands and markers for low light
  • One of Seiko's more premium watches
Best forDivingSwimmingEveryday wear

Price history

This watch is currently at its highest recorded price. It was £850 on 14 August. Prices are checked every day, and we record any changes.

£900£90014 August

Seiko Prospex Speedtimer 6R 'Compact alternatives

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

Prospex Speedtimer 6R 'Compact Countdown' 39.5mm Mens Watch Grey-White Dial compared with 2 alternatives from other brands
SpecificationThis watchProspex Speedtimer 6R 'Compact Countdown' 39.5mm Mens Watch Grey-White DialSPB513J1Nivada GrenchenAquamar Automatic 38mm Mens Watch Blue32074A01CertinaDS Action GMT Powermatic 80 41mm Mens WatchC0329292605100
Price£900£985£1,025
Case size39.5mm38mm41mm
Water resistance200m200m200m
MovementAutomaticAutomaticAutomatic
Strap—Rubber strapLeather strap
Power reserve—38 hours—
This watch
  • Wears smaller
  • Costs more
  • Wears larger

Your new watch

Frequently asked questions, and things you should know about this watch

Can I swim with it?

Yes. At 200m it is rated for swimming, snorkelling and recreational diving.

Water resistance explained

Will the glass scratch?

Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.

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

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

Listed as men's, though at 39.5mm it sits in the range that suits anyone.

Cheapest place to buy

Mappin & Webb 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 £850 and £900, today it's £900.

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