Seiko Cal. 0731 - 133

This Kinetic model from 1975 features a 37mm Hardlex-Coated Steel case. Powered by the 0731 caliber with 21j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-dea1f7d22dc4]

Also known as: Bullhead

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Champagne

Jewels

21j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1975

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