Probably a mid 60's model. I have a slightly older AlumaCraft which I power with a rebuilt 35 hp 1956 Evinrude. It is a little overpowered due to it's flat bottom, goes to fast and hits the tops of the waves hard. I will repower it with a 1956 Evinrude 18 hp, with electric start.
Those old boats look best with old motors on them.
pete