Seiko Cal. 5640 - 739

This Quartz model from 1978 features a 40mm Hardlex-Coated Steel case. It features a Black dial protected by a Hardlex crystal and offers 190m of water resistance. [seikata-wm-aa5e8a82e464]

Also known as: Turtle, Emperor

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

190m

Dial Color

Black

Jewels

21j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1978

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