The 5602R is a 1966 Evinrude
The year model of an Evinrude outboard cannot be determined from the serial number, but rather from the model number.
With that serial number it would be a 1986.
Model number 6303, would be a 1973 year model, 6hp Evinrude outboard.
Its a 1971
1972
Its a 1970 Evinrude Mate. 1.5 HP.
The year model of an Evinrude outboard engine is determined from the engine "model number", rather than the serial number.
1961 18 horsePower
That is a 1972 model.
In order to determine the year model for a Evinrude, or Johnson outboard, the engine model number is used.
Model 4263 was manufactured from 1939 to 1941.