Series 80 motor and alloy base, ball bearings wheels.
Looking at it, it looks to be in good order.
If that were your day to day mower you would be hard pressed to find anything any better.
Id say that mower is easy 30 years old and it would be better than anything you could buy new.
If its got the round cutter disc on it and its cracked, put a later model raound 4 blade disc on it. Then it will cut better than anything new as well as out last the new junk.
Being the later alloy base a catcher would not be too hard to find.
Washed, running, serviced and with a reasonable catcher i would ask $150 or so for that mower.
Bob.