It looks outstanding. Easiest and most important test: Does it turn over or is it locked up. What happens when you pull on the starter rope handle?
Is there a tank with it?
I would not expect it to run without the ignition being serviced: points cleaned and adjusted; very likely new coils and condensers. This would be routine for an old OMC motor. Would need a new water pump impeller.
Generally speaking these motors don’t have a lot of value simply because there are so many of them around. In Minnesota, $50-100 for an average example. But yours looks above average–original unrestored. Gotten running, and with a matching tank, could possibly fetch several hundred.
Others here will know better than I.
