Seiko Cal. 6639 - 931

Seiko 6639-931

The Seiko 6639-931 represents an important milestone in Seiko's 1968 lineup. Powered by the 6639 caliber with 17j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-e61670ea7b91]

Also known as: Shogun, Tuna

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
38mm
Case Thickness
12.9mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
80m
Dial Color
Black
Jewels
17j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1968

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