The year model of an Evinrude outboard cannot be determined from the serial number, but rather from the model number.
The year model of an Evinrude outboard engine is determined from the engine "model number", rather than the serial number.
Your motor is a 1955 model.
1982
An Evinrude model E4RDHSR would be a 2004, 4 hp.
1986
1988
Model number 6303, would be a 1973 year model, 6hp Evinrude outboard.
That is a 1972 model.
An 85 hp Evinrude, model number "85"093D, would be a 1970 year model. An Evinrude model number beginning with 35, would be a 35 hp engine.
Model # is E8RCSS Serial# is E0006522 Evinrude uses the model number to determine the year model. The above model number designates an 1980 model , 8 hp.
In order to determine the year model for a Evinrude, or Johnson outboard, the engine model number is used.