Seiko Cal. 5640 - 531

This Quartz model from 1999 features a 41mm Stainless Steel case. It features a Green dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-70135c4b6ac7]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Green

Jewels

23j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1999

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