Seiko Cal. 0731 - 160

This Spring Drive model from 1966 features a 41mm Gold-Plated case. With its 21mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-5e7a0a036906]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1966

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