c) could it be the case that is to be sold for off-road use only?
I don't believe there's any legal basis for this.
Less than 25 = illegal, pretty much without exception. (The one tiny sliver of an exception is SO expensive, and SO much hassle, you don't want to know)
Just curious, wouldn't someone with the reputation of Mecum Auctions require some form of due-diligence to make sure that any vehicle that comes through their auction process meet all of the applicable legal requirements?
Maybe not. I suspect Mecum don't
own the cars they sell, they're acting as an
agent for the owner. In that case, the legal responsibility would rest primarily with the owner.
If the car is in the USA presently (which is nowhere explicitly stated, as far as I can see), it was smuggled in and is thus technically contraband, subject to seizure and destruction by the US government. Even if it has license plates. Even if it's registered in a US state or territory. Even if the owner doesn't know how it got here or wasn't involved in it's importation in any way. Doesn't matter. Same would go for anyone who buys it.
On the other hand, if the car is currently in Venezuela (or anywhere else that's not the USA), which is possible, then any potential US bidders should educate themselves on import law prior to bidding. Being unable to import it to your home country (the USA) would not release you from the contractual obligation of purchase unless the seller and agent consent. Of course, a buyer could simply not pay, but I expect Mecum would have a claim irrespective of the buyer's ability to legally import.
Could be a cool car for a Canadian, though. Eh?