A Mercury 65 hp outboard, serial number 7039331 would be a 1974 year model.
A 9.9 hp Mercury outboard, serial number OG156682, would be a 1995 year model.
A 15 hp Mercury outboard, serial number OD248758, would be a 1993 year model.
A 35hp Mercury outboard, serial number 6445947, would be a 1984 model.
A 20 hp Mercury outboard, serial number OB268004 would be a 1988 model.
A 35 hp Mercury outboard, serial number A152966, would be a 1985 year model.
An 80hp Mercury outboard, serial number OC136078, would be a 1989 year model.
A 9.8 hp Mercury outboard, serial number 3485636, would be a 1973 year model.
A 9.9 hp Mercury outboard, serial number OD193606 would be a 1993 year model.
A 65 hp Mercury outboard, serial number 2604414, would be a 1969 year model.
A 20 hp Mercury outboard, serial number 5334211, would be a 1979 year model.
A 40 hp Mercury outboard, serial number 5897057, would have been manufactured in late 1981.