Tim, I’m eventually coming out your way, and when I do, I’ll be looking for something like that.
I never heard of these before, prices are a bit high some of those are in pretty rough shape, maybe people are using them for the engine.
I run a 52" Cub Cadet 2006, my FIL picked it up with 50hr for like $600 about 7yr ago and gave it to us as a house warming present, so I just keep that thing going, it was a 3 blade deck, does OK for what it is, its still in really good shape, should pick up a battery and change the oil, adjust some of the blades.
I have this old Kingwood by American Hardware Stores, think it's a large single cylinder from the late 70s or 80s, had it for 25 years, no deck, and a friend re-purposed the plow, its quite the beast, with chains and wheel weight it would leave some pretty good sized ruts in your lawn. It ran like 15year ago its been in storage for ever so its still in the "it sat out side for 20+ years, even though its 35yr old." patina.