Evinrude Aquasonic 7.5 Serial 7518-14962. What year/h.p. Is it ?

[333Fitter]

I thought it was a 1957 7.5 H.P.
But I was looking at another site and it says differently ?
Before I order parts can someone please tell me ?Thank you,,,,, Doug

 

[racerone]

A 1955 model 7.5 HP

 

[333Fitter]

Thank you,,,,,