Or,, you can contact a museum and see about donating some of the equipment to them and getting a tax writedown. Expecially an old 45 roundback. There are old iron clubs who would be thrilled to get an old combine and swather.  Same with horse drawn equipment.

The old cat would be something old construction iron clubs are interested in.

Just spend some time on the net (not on this site) and ask those folks, run some ads where you can find buyers.  It doesn't really matter what the part or machine is,, someone is always looking for one.  Even if you don't make a fortune on the stuff, if you can sell/donate and not have to doink around cutting it up and hauling it off your still time/money ahead.