Seiko Cal. 6637 - 639

Seiko 6637-639

The 6637-639 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6637 caliber with 32j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-d6adff641ff7]

Also known as: Rally

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
14.9mm
Lug Width
22mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
90m
Dial Color
Burgundy
Jewels
32j
Frequency
21,600 bph
Power Reserve
61 hours
Year
1997

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