Kensington Watches
Seiko Presage Classic Series 'Sumi-iro' Open Heart 40mm Mens Watch Black

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Seiko

Seiko Presage Classic Series 'Sumi-iro' Open Heart 40mm Mens Watch Black

Ref. SPB471J1

Among our 186 Seiko watchesThis watch£1,100
Premium

Sits in Seiko’s upper tier here — more premium than three quarters of the Seiko watches we list, which start at £110.

Price range £110 to £3,550 across 186 Seiko watches in stock.

The dial takes its name from *sumi-iro*, the Japanese term for ink-black, and its texture from raw silk yarn — a radial pattern that shifts under light across the dark charcoal surface. The open-heart window at 9 o'clock frames the balance wheel directly, while a 24-hour subdial sits recessed at 6. The dual-curved sapphire crystal carries an inner anti-reflective coating, and the case measures 40.2 mm across and 13 mm deep with a Super-Hard Coating over the stainless steel. The seven-piece bracelet draws on 1970s metal bracelet design, with short 6 mm links and solid end links that follow the wrist closely. A push-button deployment clasp secures the fit. Inside, the in-house 6R5J automatic runs at 21,600 vph with a 72-hour power reserve. A screw-down exhibition caseback reveals the movement from the reverse.

Reference
SPB471J1
Brand
Seiko
Collection
Presage
Case size
40.2mm
Case thickness
13mm
Lug width
20mm
Case material
Stainless steel
Case shape
Round
Dial
White
Crystal
Sapphire
Movement
Automatic
Calibre
6R5J
Functions
Skeleton dial
Water resistance
100m
Bracelet / strap
Stainless steel bracelet
Strap colour
Silver
Clasp
Deployant clasp
Lume
Super-LumiNova
Retailer
Mappin & Webb
Additional specifications
Lug-to-lug
46mm
Power reserve
72 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.

All Seiko watches

Also in 4 collections

This watch appears in the Seiko Presage range (41), Stainless Steel Watches (3,088), Automatic Watches (1,763) and Skeleton Watches (314).

What the specifications mean

A mechanical watch for everyday wear.

Strengths

  • 100m water resistance covers swimming and watersports
  • 46mm lug-to-lug keeps the 40.2mm case wearable
  • Sapphire crystal, which resists scratching
  • 72-hour reserve survives a weekend off the wrist
  • Luminous hands and markers for low light
Best forSwimmingEveryday wear

Price history

This watch is currently at its highest recorded price. It was £1,060 on 10 August. Prices are checked every day, and we record any changes.

£1,100£1,10010 August

Seiko Presage Classic Series 'Sumi-iro' alternatives

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

Presage Classic Series 'Sumi-iro' Open Heart 40mm Mens Watch Black compared with 2 alternatives from other brands
SpecificationThis watchPresage Classic Series 'Sumi-iro' Open Heart 40mm Mens Watch BlackSPB471J1HamiltonKhaki Field Expedition Auto 41mm Mens Watch White Dial Stainless SteelH70315110TissotPRX Powermatic 80 40mm CarbonT1379079720100
Price£1,100£1,035£960
Case size40.2mm41mm40mm
Water resistance100m100m100m
MovementAutomaticAutomaticAutomatic
StrapStainless steel braceletStainless steel braceletSilicone strap
Power reserve72 hours80 hours80 hours
This watchClosely matched
  • Costs less

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?

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

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

About 72 hours fully wound — enough to sit off the wrist over a weekend and still be running.

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 46mm, which suits wrists from roughly 16cm (6¼ inches) upward.

Lug-to-lug decides fit more than case diameter does.

How to size a watch to your wrist

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

Listed as men's.

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 £1,060 and £1,100, today it's £1,100.

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