Seiko Cal. 0731 - 150

This Spring Drive model from 1967 features a 35mm PVD Black case. With its 22mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-58bbef9724d3]

Also known as: Bullhead, Arnie

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

11.1mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Green

Jewels

31j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1967

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