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1961 18 horsePower
1972 25hp
Model number 6303, would be a 1973 year model, 6hp Evinrude outboard.
Johnson and Evinrude outboards, use the model number, rather than the serial number, to determine the year model. Mercury outboards, uses serial number and horsepower.
Serial number 35514 show up to be a 1958. A list of serial number are post on http://www.marineengine.com/manuals/evinrude/
The year model of an Evinrude outboard cannot be determined from the serial number, but rather from the model number.
Evinrude and Johnson outboards use the engine model number, rather than the serial number, to determine the year model. The model number will be on the same plate/sticker as the serial number.
The 5602R is a 1966 Evinrude
With that serial number it would be a 1986.
The year model of an Evinrude outboard engine is determined from the engine "model number", rather than the serial number.
Evinrude outboards requires the model number to determine the year of the engine.
it is a 1945-1949 Lightfour 9.7 Hp by evinrude