Seiko Cal. 5631 - 187

This Spring Drive model from 1978 features a 46mm Stainless Steel case. The Bidirectional bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-8a9c2f96ce37]

Also known as: Flighty

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1978

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