Seiko Cal. 5231 - 776

This Spring Drive model from 1966 features a 41mm Hardlex-Coated Steel case. It features a Burgundy dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-c988680b0881]

Also known as: Monster, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Burgundy

Jewels

34j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1966

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