Seiko Cal. 6637 - 644

Seiko 6637-644

The 6637-644 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6637 caliber with 35j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-a1bf5295e43a]

Also known as: Rally

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
12.4mm
Lug Width
19mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
90m
Dial Color
Green
Jewels
35j
Frequency
36,000 bph
Power Reserve
38 hours
Year
1991

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