Seiko Cal. 5639 - 131

The Seiko 5639-131 represents an important milestone in Seiko's 1997 lineup. Powered by the 5639 caliber with 17j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-38e698b0f4a6]

Also known as: Sportsmatic, Sea Horse

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Green

Jewels

17j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1997

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