The motor is a 1947 2hp. Great little motors. I have two of my own.
1939 2 hp
1946 middle year
A 15 hp Evinrude, model number RCIS would be a 1981 year model.
All Johnson and Evinrude outboards manufactured prior to 1965, require a 24:1 fuel to 2 cycle oil ratio.
No sn data available
No sn data that I know of
No sn data published
the Iver Johnson website has some sn info IIRC
8 minutes old
No sn data that I am aware of in the public domain
No published sn data.
How old is my Mercury Tunerbolt 7.5 hp sn 3016729