1987
1988
The Mercury with serial number 9372470, made in Belgium, was produced in 1977. The serial number indicates the production year, as Mercury used a specific numbering system to track the manufacturing dates of their outboard motors.
From what I can find in serial number tables, your outboard is made in 1975. My refernce: http://www.marinshopen.se/Hj%c3%a4lpmedel/Modellguide/Mercury/3565Hk/tabid/107/Default.aspx
Usually the serial number is on a tag mounted on the bracket that holds the outboard engine to the boat.
1985
How old is tohatsu outboard M25A serial number 34166
The 20HP Mercury outboard with serial number 9137627 was made in 1979.
whats the serial number
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.