Seiko Cal. 5631 - 821

The Seiko 5631-821 represents an important milestone in Seiko's 1965 lineup. Powered by the 5631 caliber with 32j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-3fc9fdbd6c61]

Also known as: Goldfeather, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

15.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1965

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