Seiko Cal. 6639 - 948

The Seiko 6639-948 represents an important milestone in Seiko's 1982 lineup. The Coin-Edge bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-df4df7f6ce52]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

White

Jewels

23j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1982

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