Seiko Cal. 5631 - 920

The 5631-920 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5631 caliber with 30j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-884f04928777]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1991

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