Seiko Cal. 0731 - 651

This Hand-Winding model from 1973 features a 40mm Hardlex-Coated Steel case. With its 22mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-74e084cb5ece]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1973

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