If OB is listed as serial number prefix, it would be a 1987 year model.
The serial number OC121590 indicates that your Mercury 45 HP Classic Fifty outboard motor was likely manufactured in 1976. Mercury outboard motors typically use a coding system where the letters and numbers in the serial number correspond to the year of production. For more precise information, you can consult a Mercury outboard motor reference guide or contact a Mercury dealer.
The 20HP Mercury outboard with serial number 9137627 was made in 1979.
The serial number 9137327 for a 20 HP Mercury Outboard is not not listed in the Mercury Marine parts catalog.
To determine the age of a Mercury outboard, you will need to know the engine serial number, and the horsepower rating.
A 9.9 hp Mercury, serial number OG031959, is a 1995 year model outboard.
Two things are needed to determine the age of a Mercury outboard, the serial number, and the horsepower rating.
A 9.9hp Mercury outboard, serial number OB120743, is a 1987 year model.
An 20 hp Mercury outboard, serial number 3143107, is a 1971 year model.
Two items are needed to determine the age of a Mercury outboard, the serial number and the horsepower rating.
In order to determine the age of a Mercury outboard, in addition to the the serial number, the horsepower is needed.
A 35hp Mercury outboard, serial number A184641, 1985 year model.
A 9.8 hp Mercury outboard, serial number 2389278, is a 1968 year model.