1978/79 model ?
I'd guess a lil newer, early 80's.1978/79 model ?
Looks like a 1977. Cowling decal design looks a lot like the factory parts diagram. No power trim. If it had trim-the 77 trim was the old-style which mounted outboard of the transom brackets. You can confirm using boobie's i.d. method. Here is a pic of the core plug he refers to. The 77 used a single power pack. The 78 and up used two-for a number of years.