Seiko Cal. 6637 - 557

This Quartz model from 1991 features a 45mm PVD Black case. With its 20mm lug width and 13.3mm profile, it sits comfortably on most wrists. [seikata-wm-4f5fef8daea2]

Also known as: Samurai, Sumo

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

45mm

Case Thickness

13.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1991

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