Seiko Cal. 5640 - 904

This Quartz model from 1982 features a 37mm Two-Tone case. It features a Silver dial protected by a Sapphire crystal and offers 120m of water resistance. [seikata-wm-26e5d169c8e5]

Also known as: Monster

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1982

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