Seiko Cal. 6637 - 691

Seiko 6637-691

The 6637-691 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6637 caliber with 28j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-b98f9506cfb1]

Also known as: Sumo, Golden Tuna

Specifications

Movement
Quartz
Case Material
Gold-Plated
Case Width
43mm
Case Thickness
10.0mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
60m
Dial Color
Champagne
Jewels
28j
Frequency
36,000 bph
Power Reserve
41 hours
Year
1980

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