Seiko Cal. 6637 - 835

Seiko 6637-835

The 6637-835 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6637 caliber with 18j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-c79d8700df30]

Also known as: Bullhead

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
39mm
Case Thickness
13.3mm
Lug Width
21mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
120m
Dial Color
White
Jewels
18j
Frequency
21,600 bph
Power Reserve
66 hours
Year
1997

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seikata-wm-c79d8700df30