Seiko Cal. 5640 - 568

The 5640-568 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Hardlex crystal and offers 110m of water resistance. [seikata-wm-40d9769ca6b9]

Also known as: Bellmatic, World Timer

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

110m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1988

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