Seiko Cal. 5631 - 373

The Seiko 5631-373 represents an important milestone in Seiko's 1976 lineup. Powered by the 5631 caliber with 19j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-2a0f9a290862]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

42mm

Case Thickness

13.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

80m

Dial Color

Champagne

Jewels

19j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1976

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