Seiko Cal. 6639 - 636

This Spring Drive model from 1994 features a 35mm Stainless Steel case. Powered by the 6639 caliber with 25j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-2f28d97f406d]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

40m

Dial Color

White

Jewels

25j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1994

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