Seiko Cal. 6637 - 425

Seiko 6637-425

The 6637-425 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6637 caliber with 31j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-96256becf2d2]

Also known as: Rally

Specifications

Movement
Kinetic
Case Material
PVD Black
Case Width
36mm
Case Thickness
14.5mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
60m
Dial Color
White
Jewels
31j
Frequency
21,600 bph
Power Reserve
39 hours
Year
1966

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