That's a 1993.
A 75 hp Mariner, serial number OC282117 is a 1990 year model.
qg616727
1988
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.
1990
Approx 1995
A 15 hp Mercury outboard, serial number OD248782 is a 1993 year model.
An 75 hp Mariner outboard, serial number OB346777, would be a 1988 year model, with a dry weight of 265 lbs.
A 15 hp Mercury outboard, serial number OG156835, would be a 1995 year model.
A 15 hp Mercury outboard, serial number OB31814B, would be a 1988 year model.