I went to an auction about a month ago not far from here, it was one of those big spring cleaning type consignment sales.
The preview of the sale showed a handful of old yellow AC tractors, Most were pretty much just parts machines or in need of total major restoration. None of them ran, and I doubt any of them would even roll due to having sat outdoors for decades.
The bidding on the AC machines started as usuall but soon ran up well over anything I'd have thought was reasonable for a rusted or smashed up old AC. The one looked as if it fell of a truck at high speed on the highway, nearly all the sheetmetal was smashed, the front spindles were both bent, the steering wheel and shaft were smashed down over the dash area, and all four tires were rotted completely off the rims leaving only tattered sidewalls. I think the model was a B-210. The motor was stuck, it had no deck or accessories. It sold for $425.
The next AC was a B -110, which although was complete was well covered in rust and poison ivy vines. It had four flat tires, the steering was frozen, and the seat was a pile of mush sitting atop the rotted out fender pan. The trans shifted and the motor wasn't stuck. It sold for $360.
The next AC was an unknown model, missing most of its tin with only a hood and rusted fender pan, this one had a snow plow on it that was rigged on with a homemade bracket, no deck, and the transmission belt was gone. The engine turned but spun like a top when I gave the crank a twist. That one sold for $225.
There were several newer Simplicity and AC machines as well but they sold cheap, with the highest orange model being an 8hp belt drive model that sold for $125. I watched several 7100 models sell for $17, $20, and $30 with one 916H being a complete machine with a shuttle drive that looked fairly decent with only sitting wear.
I watched one guy win a 7116S and a 7119H at $17 for the pair. The 7116S ran with a battery and some new fuel hose, the 7119H had a bad motor and a ton of transmission leaks.
What sort of prices are the yellow machines bringing elsewhere? Online I don't see them bringing the sort of money those did at auction. I had a rolling, complete B1 a few months ago that I couldn't get $200 for, and all it needed was to fix the lack of spark and a battery to make it run. I ended up parting it out bit by bit.
I also watched a yellow AC snow plow get sold for $225 and I bought a dirt plow with its sleeve hitch for $15 at another auction. There was a Simplicity 725 in that sale that sold for over $500 with a deck, but they sold the rest of the attachments separate.
Its snow plow sold for $75, a belly grader blade sold for $165, a snow blower sold for $25, and I got the mold board plow for $15.