Seiko Cal. 5631 - 667

This Automatic model from 1988 features a 42mm Stainless Steel case. Powered by the 5631 caliber with 28j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-45da3fc1b18c]

Also known as: Monster, Helmet

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1988

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