Looks just exactly like the 90 in my barn, except the welded crack on my cover is smaller! Mine has the "star" gas cap, "crossbar" oil cap, cutaway on the side where hot air exits looks the same, thumb nut holding air cleaner is same, spark plug cover too.
Be aware that the 80 and 90 were about the same saw, ust different bore diameters, so you'll need to check that to be certain. those older saws are wonderful for inexperienced users...lots and lots of torque, pull harder at low rpm, even though they don't have the peak HP of a newer saw. Be careful, though, as they don't have a chain brake, and the bigger the saw, the bigger chance of snapping a chain in a tough cut.
I look my chains over very carefully after wintertime cutting. The links can get hot in a tough cut, then chill rapidly in the snow and cold, or in wet wood. I see cracks sometimes around rivet holes and usually get a little worried and discard the chain, rather than take a chance...