Seiko Cal. 6397 - 650

Seiko 6397-650

The 6397-650 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6397 caliber with 23j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-e43a7d0024a7]

Also known as: Helmet, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
14.3mm
Lug Width
21mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
90m
Dial Color
Black
Jewels
23j
Frequency
28,800 bph
Power Reserve
63 hours
Year
1995

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