Seiko Cal. 5644 - 661

This Quartz model from 1978 features a 45mm Hardlex-Coated Steel case. It features a White dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-aa93ae2aa58d]

Also known as: Monster

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

12.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

56 hours

Year

1978

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