Seiko Cal. 5639 - 634

The Seiko 5639-634 represents an important milestone in Seiko's 1986 lineup. Powered by the 5639 caliber with 17j jewels beating at 21,600 bph, it delivers a 52 hours power reserve. [seikata-wm-d189beb7ca47]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Navy

Jewels

17j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1986

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