Seiko Cal. 5631 - 346

The Seiko 5631-346 represents an important milestone in Seiko's 1987 lineup. With its 20mm lug width and 13.9mm profile, it sits comfortably on most wrists. [seikata-wm-7cf6084ca6ab]

Also known as: World Timer, Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

13.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Champagne

Jewels

25j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1987

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