@ xl130
You made me look.
My Farmsaw under "Model" says FM, under "Date" is an 80, it is possible, I purchased her in 1979 or 1980. My only requirements were no chain brake and a 20" bar.
I originally had a Skill 16" that I hated and I may have been at blame. The Skill saw was delivered at 4100 feet (Alamogordo NM) and I don't think I ever ran it there. I attempted to use it at 8100 feet (Cloudcroft NM area). Every outing was a struggle; 1. To get it running; 2. Refueling it; it boiled away almost an entire tank of fuel every time I refueled. I think I only tried using it twice, on two different outings. I gave it to the saw shop where I bought my Farmsaw. I came very close to tossing it over the edge of a very deep gorge while at Cloudcroft!