Seiko Cal. 6634 - 761

The Seiko 6634-761 represents an important milestone in Seiko's 1977 lineup. The Coin-Edge bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-5ed8913c9093]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Burgundy

Jewels

25j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1977

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