Seiko Cal. 5631 - 527

The Seiko 5631-527 represents an important milestone in Seiko's 1965 lineup. The Rotating bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-703d7c401b73]

Also known as: Sumo, Crown

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1965

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