Seiko Cal. 5644 - 380

This Spring Drive model from 1970 features a 43mm Hardlex-Coated Steel case. It features a Champagne dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-86a5e4c8932b]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Champagne

Jewels

35j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1970

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