Seiko Cal. 6639 - 766

The Seiko 6639-766 represents an important milestone in Seiko's 1975 lineup. The Coin-Edge bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-184fc8bcddb2]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Silver

Jewels

17j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1975

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