Seiko Cal. 5231 - 136

This Spring Drive model from 1994 features a 40mm Hardlex-Coated Steel case. It features a Green dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-fe088f153857]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1994

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