</font><font color="blue" class="small">( My understanding was that the seller was agreeing to hold the tractor -- maybe I read that wrong.)</font>
"The seller and I agreed on price and delivery was set."
</font><font color="blue" class="small">( In any event, if it wasn't in writing, my guess is the Statue of Frauds would apply anyway.)</font>
Interesting point, here. The Statute of Frauds does not actually require that the contract itself be in writing, but that there be some evidential memorandum or other writing that indicates that an oral contract exists. If there is no writing, the oral contract still exists, but it is voidable.
What's interesting is in this day of electronic communication, what constitutes "writing"? Photos were sent. The seller emailed the buyer that the tractor had been sold. Without more information, one could envision a scenario that the entire exchange, or substantial amounts of it, were by email. If so, the emails could be patched together to be sufficient "writing" to satisfy the Statute of Frauds. I admit I'm doing some "supposing", here.
Regardless, after re-reading all of the messages, it appears that the buyer did not suffer sufficient detriment to require a damage award. He didn't travel to pick up the tractor, he probably didn't pass up a good deal on another tractor because of the seller's promises, he probably just suffered disappointment. So, while there is an oral contract, and the real possibility of some sort of evidence to satisfy the Statute of Frauds, it probably is just a nice technical point of law, and no point in pursuing it because there was no real damage. About the only thing that could possibly be ordered would be specific performance; the seller has to deliver the tractor to the buyer in return for the payment. That would probably only apply to one of a kind items, that is, if there are no other similar tractors available at a similar price.
Bottom line, I think I was right that there was an oral contract, very possibly enforceable, but probably wrong about damages, unless the buyer can document how he was hurt.