Tap the image to enlarge
Seiko 5 Sports HDB006K1 Automatic Sports Field Bracelet Watch - W25559
Ref. HDB006K1
See more premium optionsHide
Stepping up in the same colour and case shape
The Field series within Seiko 5 Sports has always drawn on military utility — the trench watch tradition of bold legibility and a case built to take punishment — but this reference marks two firsts for the line: a 41mm case, and a bidirectional rotating bezel with the kind of aggressive knurling you can actually grip with cold or wet fingers rather than fiddle with. That combination gives this watch a more purposeful character than its predecessors without departing from what the collection has always been about. At 48.5mm lug to lug the footprint is friendlier on the wrist than the case diameter alone suggests, and 13.2mm is a measured thickness for a watch with a rotating bezel sitting above it. The glossy black dial uses a textured outer ring to give the face some dimension, and the Arabic numerals and hands carry enough LumiBrite that dark-condition legibility is genuine, not decorative. The 4R36 inside is a movement Seiko has refined over many years — it hacks, it winds manually, and it runs with the kind of consistency that earns a reputation across a very wide range of wearers. The exhibition caseback means the rotor is visible rather than hidden behind solid steel, which is a reasonable thing to offer on a watch whose mechanical character is part of the point.
- Reference
- HDB006K1
- Brand
- Seiko
- Case size
- 41mm
- Case thickness
- 13.2mm
- Lug width
- 20mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Hardlex
- Bezel
- Bidirectional rotating
- Movement
- Automatic
- Calibre
- 4R36
- Functions
- Day-date, Compass
- Water resistance
- 100m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- LumiBrite
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 48.5mm
- Power reserve
- 41 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.
Manufacturer’s guarantee
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 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 | HDB006K1 |  MTTS1F501 |  RA-AR0009L30B |
|---|---|---|---|
| Price | £360 | £400 | £365 |
| Case size | 41mm | 41mm | 40.8mm |
| Water resistance | 100m | 100m | 50m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Leather strap | Stainless steel bracelet |
| Power reserve | 41 hours | — | 40 hours |
| 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?
It resists most everyday knocks. Hardlex is a hardened mineral glass — tougher than standard mineral, softer than sapphire.
Does it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
How long does it run for when it's not worn?
About 41 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
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 48.5mm, which suits wrists from roughly 16.5cm (6½ inches) upward.
Lug-to-lug decides fit more than case diameter does.
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.
You may also like
In stock, and close on style and price
