Seiko Cal. 5630 - 377

This Spring Drive model from 1988 features a 44mm PVD Black case. Powered by the 5630 caliber with 31j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-d17d62257524]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1988

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