C Service, which still exists. Originally the class was for the OMC 30 ci opposed twin with the "service" (stock) lower unit.
In the 50s and 60s, there was C Service, Section 1 and C Service Section 2. Section 1 was the original OMC motor. I think I recall that then current fishing engines such as the Merc Mark 30 ran in section 2.
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