Seiko Cal. 5231 - 165

This Spring Drive model from 1966 features a 38mm Titanium case. With its 18mm lug width and 11.6mm profile, it sits comfortably on most wrists. [seikata-wm-1590f343dc3d]

Also known as: Bellmatic, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Black

Jewels

18j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1966

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