Seiko Cal. 6631 - 523

This Hand-Winding model from 1977 features a 42mm Stainless Steel case. Powered by the 6631 caliber with 36j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-98db63fbe87b]

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1977

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