Seiko Cal. 6397 - 431

Seiko 6397-431

The 6397-431 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6397 caliber with 26j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-9e666e5bec58]

Also known as: UFO, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
12.3mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
190m
Dial Color
Black
Jewels
26j
Frequency
21,600 bph
Power Reserve
68 hours
Year
1975

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