Seiko Cal. 6641 - 957

This Spring Drive model from 1968 features a 39mm Stainless Steel case. It features a Green dial protected by a Acrylic crystal and offers 110m of water resistance. [seikata-wm-7b17656b413e]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

110m

Dial Color

Green

Jewels

18j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1968

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