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What year is the mariner 9.9c 682cs 066674
1998
1991
1990
9989819
1990
Along with the engine serial number, the horsepower rating is needed to detemine the year model for a Mariner outboard.
think its the last 2 numbers of serial is year so 1980 i think
its 1981 model 50/1 fuel
A 75 hp Mariner, serial number OC282117 is a 1990 year model.
A 150 hp Mariner outboard, serial number OB199335 would be a 1987 year model.
A 9.9 hp Mariner outboard, serial number OC269812, would be a 1990 year model.