Seiko Cal. 0742 - 637

Seiko 0742-637

The Seiko 0742-637 represents an important milestone in Seiko's 1978 lineup. Powered by the 0742 caliber with 21j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-f7077accd8df]

Also known as: Sumo, Sportsmatic

Specifications

Movement
Quartz
Case Material
Titanium
Case Width
41mm
Case Thickness
9.8mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Rotating
Water Resistance
60m
Dial Color
Burgundy
Jewels
21j
Frequency
21,600 bph
Power Reserve
48 hours
Year
1978

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