Seiko Cal. 5640 - 694

This Spring Drive model from 1970 features a 41mm Stainless Steel case. Powered by the 5640 caliber with 26j jewels beating at 21,600 bph, it delivers a 38 hours power reserve. [seikata-wm-39fce2e5b6bb]

Also known as: Turtle, UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

10.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

50m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1970

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