Seiko Cal. 5631 - 430

The Seiko 5631-430 represents an important milestone in Seiko's 1978 lineup. Powered by the 5631 caliber with 33j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-36dfc4758851]

Also known as: Pogue, Bullhead

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

15.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1978

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