Seiko Cal. 5690 - 631

The Seiko 5690-631 represents an important milestone in Seiko's 1980 lineup. Powered by the 5690 caliber with 28j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-0dff190fe0a2]

Also known as: Goldfeather

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

12.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Silver

Jewels

28j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1980

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