What year 20hp Merc?

[mikejackson81]

I have a 20hp Merc, serial number 3142527, that I need to know what year. The search tool at Mercury's website returned an error because pre-1980 serial numbers are only 7 digits, and the tool requires 8. Thanks in advance.

 

[Trent]

Re: What year 20hp Merc?

1971