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Seiko Coutura SSB443P1 Black IP Chronograph Bracelet Watch - W25427
Ref. SSB443P1
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Stepping up in the same colour and case shape
The Coutura line sits above Seiko's mainstream sports range, and one of the ways it earns that position is the movement. The 8T63 is a meca-quartz calibre: quartz for timekeeping accuracy, but with a mechanical heart driving the chronograph. The result is a seconds hand that sweeps rather than steps, and a reset that snaps the hand back to zero with the kind of authority you would expect from a movement twice the price. It is a meaningful distinction that disappears entirely from the dial. At 42mm the case reads large, but at 11.8mm thick it sits flatter than the bold geometry suggests. The bracelet flows from the lugs without a visible break, so the whole thing hugs the wrist rather than perching on it — a detail that matters more on a watch this dark and angular than on something conventional. The multi-layered dial and the all-black exterior are designed to absorb light rather than reflect it, with the silver hands and LumiBrite-coated indices doing the work of contrast, both in daylight and after dark.
- Reference
- SSB443P1
- Brand
- Seiko
- Case size
- 42mm
- Case thickness
- 11.8mm
- Lug width
- 20mm
- Case material
- Black PVD
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Bezel
- Fixed tachymeter
- Movement
- Quartz
- Calibre
- 8T63
- Functions
- Chronograph, Date, Small seconds, Tachymeter
- Water resistance
- 100m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Black
- Clasp
- Three-fold clasp
- Lume
- Luminous
- Retailer
- F.Hinds
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.
Manufacturer’s guarantee
What the specifications mean
Strengths
- 100m water resistance covers swimming and watersports
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- Sits in the lower half of Seiko's range as we list it
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | SSB443P1 |  T1164171105200 |  MTRS1F503 |
|---|---|---|---|
| Price | £379 | £385 | £320 |
| Case size | 42mm | 42mm | 42mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Quartz | Quartz | Quartz |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Stainless steel bracelet |
| This watch | Closely matched |
|
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?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
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.
Is it a men's or women's watch?
Listed as men'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.
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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