Seiko Cal. 5631 - 284

The Seiko 5631-284 represents an important milestone in Seiko's 1979 lineup. Powered by the 5631 caliber with 22j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-e4974c183374]

Also known as: Bullhead, Flighty

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

14.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1979

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