Seiko Cal. 6639 - 761

The Seiko 6639-761 represents an important milestone in Seiko's 1988 lineup. Powered by the 6639 caliber with 35j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-81cc6363fe36]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Solar

Case Material

Titanium

Case Width

35mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Cream

Jewels

35j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1988

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