I used to have an old F12. Not sure what year it was, but a decal on the hood (still in good shape) said it was patented in 1923. I had it on 36" rubber but also had the original steel wheels, both front and rear. I paid $125 for in in the 50's and sold it in the 80's for $750 with the steel wheels included. The guy who bought it was a collector. The tractor was essentially new when I bought it, because the first owner bought it new, tried it once and parked it because he liked using his horses better. I then bought it in the late 50's. I think it was supposed to be 15HP. Crank to start, 2 fuel tanks. An inner tank for gas and an outter tank for kerosene. I only used it with gas, but was told the original design was to start it on gas, then switch to kerosene. Then switch back to gas for a little while before shutting it off to get gas to the carb. The tractor was well powered (I think horses were bigger back then) but it was pitifully slow. I walked faster than top speed in hi (3rd) gear.
I think you will like the tractor, you should be able to restore it if you want.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.