Seiko Cal. 6631 - 821

This Spring Drive model from 1990 features a 41mm PVD Black case. Powered by the 6631 caliber with 22j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-372d172fffd3]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

190m

Dial Color

White

Jewels

22j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1990

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