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Also what is the vehicle in the front with red rims? A tractor? A cannon?
I believe the answer to your question is a steam tractor with a flywheel. Although Fred Dibnah (among many others) could probably answer the exact model, I certainly can't. If you don't know who Fred is, strongly suggest you look him up. Absolutely one of the most fascinating people I never knew. He had a series on BBC where he went around the UK helping to save steam powered technology, when he wasn't dropping smokestacks for a living.
I enjoyed going to steam rallies when I lived in England. The noise and smell and rumble of those huge things moving around were almost as fun as watching them power stations threshing clover seed or cutting lumber or setting up a machine shop with huge leather belts transferring power to them all. A bygone era today's kids probably know nothing about.
Your postcard is also pretty neat. I would imagine there was not a large number of any kind of mail going from Tucumcari to Germany. Even today there is not a great deal there (Tucumcari, not Germany...). I only stop there to get gas and use the rest room when I am jetting down I-40 for whatever reason.
Edit: Threshing vs thrashing
