Seiko Cal. 6637 - 281

Seiko 6637-281

The 6637-281 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 23j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-4ab25d578011]

Also known as: Monster, Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
37mm
Case Thickness
14.0mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
30m
Dial Color
Green
Jewels
23j
Frequency
28,800 bph
Power Reserve
49 hours
Year
1977

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seikata-wm-4ab25d578011