Seiko Cal. 4531 - 637

The Seiko 4531-637 represents an important milestone in Seiko's 1984 lineup. Powered by the 4531 caliber with 25j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-601cccf78a07]

Also known as: Bullhead

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

40mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Navy

Jewels

25j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1984

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