Seiko Cal. 5640 - 531

Seiko 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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seikata-wm-70135c4b6ac7