Not positive but I think its 1975
A 20 hp Mercury outboard, serial number OG156340, is a 1995 year model.
An 20 hp Mercury outboard, serial number 3143107, is a 1971 year model.
A 20 hp Mercury outboard, serial number OB268004 would be a 1988 model.
A 20 hp Mercury outboard, serial number 5334211, would be a 1979 year model.
The serial number 9137327 for a 20 HP Mercury Outboard is not not listed in the Mercury Marine parts catalog.
A 20 hp Mercury outboard, serial number OB152174, would be a 1987 year model.
whats the model number
1977 according to SELOC manual
It was made in Canada in 1988.
close to 20 years
The dry weight for a 1988 model, 20 hp Mercury outboard is 105 lbs.
A 1993 model, 20 hp Mercury outboard, has a dry weight of 112 lbs.