Seiko Cal. 6688 - 597

This Spring Drive model from 1976 features a 36mm PVD Black case. With its 19mm lug width and 13.8mm profile, it sits comfortably on most wrists. [seikata-wm-2895fb788534]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

13.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1976

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