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ISO 6425 dive watch · 1996–2019

Seiko SKX007

The reference everyone learns mechanical diving on. Bulletproof Seiko 7S26 inside, ISO 6425 dive certification, the matte-black dial that launched a thousand mods.

Ticking now
12:00:00
Seiko SKX007 on its jubilee bracelet

The people's diver

Launched in 1996 as the successor to the SKX001, the SKX007 became the archetypal Seiko diver — 200 m water resistant, ISO 6425 certified, with the company's unbreakable 7S26 caliber. Day and date at 3, lume thick enough to read in a coffin.

Discontinued in 2019 after a 23-year run, the SKX007 is one of the most-modded watches in the world. The case, dial, hands, bezel insert, even the crown and chapter ring all have aftermarket replacements. A starting-point watch and an end-point watch in one.

Inside the Seiko SKX007

The 7S26 has no manual winding and no hacking seconds — it just runs, for years, on the wrist motion alone. Crude in feel, almost unbreakable in practice.

Caliber

Seiko 7S26

21,600 bph3 Hz
1.000 rev/hcentre · minute hand · 80T8.0 rev/hthird · 60T / 10P60 rev/h · 1 rev/minfourth · seconds hand · 60T / 8P12.0 rev/minescape · 15T / 5Ppallet forkbalance · 21600 bph
6.00 Hz · 21,600 bph
Movement
Seiko 7S26
automatic, day-date
Frequency
21,600 bph
3 Hz
Jewels
21
Reserve
~41 hours
Case
42.5 mm steel
200 m ISO 6425
Years
1996 – 2019
replaced by SRPD series