Seiko Cal. 4531 - 526

This Spring Drive model from 1966 features a 36mm Stainless Steel case. Powered by the 4531 caliber with 18j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-491ef9ed13be]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

12.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1966

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