Seiko Cal. 6637 - 997

Seiko 6637-997

The Seiko 6637-997 represents an important milestone in Seiko's 1980 lineup. The Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-ed4dd745acd9]

Also known as: Sumo, Sportsmatic

Specifications

Movement
Kinetic
Case Material
Two-Tone
Case Width
39mm
Case Thickness
8.9mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
50m
Dial Color
Burgundy
Jewels
33j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1980

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