Seiko Cal. 6637 - 280

Seiko 6637-280

The Seiko 6637-280 represents an important milestone in Seiko's 1975 lineup. Powered by the 6637 caliber with 24j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-06495836a667]

Also known as: Sumo, Tuna

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
42mm
Case Thickness
14.0mm
Lug Width
19mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
80m
Dial Color
Green
Jewels
24j
Frequency
28,800 bph
Power Reserve
58 hours
Year
1975

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