Seiko Cal. 5639 - 591

This Spring Drive model from 1973 features a 40mm Stainless Steel case. Powered by the 5639 caliber with 31j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-ed370baa1f20]

Also known as: UFO, Flighty

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1973

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