Now you're getting into a very interesting line of thought, which I've long wondered about myself. I would imagine 95-99+% of the ancient coins we collect were excavated at some point in the last few centuries. But it is interesting to speculate on how many came down to us through continuous ownership - above ground - for the last couple of millennia. There are bound to be a few.
I'm thinking maybe museum quality stuff. But wars and cultural purges get in the way. Thinking ISIS and Palmyra here.
ISIS in Palmyra is but a tiny, recent, short hiccup in the turbulence of history. There were Crusaders, Mongols, and all sorts of other interesting (if sometimes violent) players on the stage before that. And that's part of the allure of ancient coins and artifacts. They're time travelers and have seen so much.
The best surviving coins could be buried for 2000+ years with no problem if they were the lucky ones to be in the middle of a sealed pot buried in a dry climate or under circumstances where there was no chemical fertilizer in the soil. Even burials in poor conditions can include good coins in the center of the bunch even if the outer parts were ruined. Some coins form a protective patina that almost identifies where they were found by the color. As long as some fool does not try to remove the patina, they can be quite nice. There are even coins that look good after spending centuries under water where there was no oxygen or other corrosive materials. I do believe that much of the damage to field find single coins has been worsened in the last century since people started dumping harsh chemical fertilizers on fields not previously treated with anything stronger than manure. There are many factors which explains why there are so many different outcomes. Very few coins stayed above ground. For the most part, ground level has raised so even a coin on the floor of a building would be covered with a few feet of dust after so long a period. Also, relatively few coins are found in archaeological sites sites. Think about it. There were no banks so you would hide your cash in a pot buried somewhere only you knew but not inside your house or in the town square. Things buried in unsealed pots, leather or cloth would not survive as well but if you stash a few million coins, a few thousand will survive well and a few hundred will be perfect. I don't think people today realize how many coins were made each week back then. The ones that stayed above ground were more likely to be melted and recoined in the new fashion. We have the ones lost and those hidden well enough they were not found.
The issues with discussing or bringing attention to specific, actively selling coins is apparent. But the OP simply brought attention to the auction itself. Is this considered a problem? I personally appreciate the heads up, and I'm sure that Mr. Robinson doesn't mind people spreading the word. True, winning coins at an auction such as this is easier if others are generally ignorant of it's existence. But auctions such as this will cease to exist if enough people are not aware. Fine line.
And a nice one it is, too. Maybe I'll get to join the club. I had a Julia Mamaea denarius in my old pre-recession collection, but can't remember what was on its reverse. It was pretty dark, and on a tight flan, as I recall, but attractive. Got it fairly cheaply, I think.
Very glad to see this reminder posted here. I was not aware he was holding another auction so soon after the last. I put in a bid on something, we'll see how it goes tonight.
I imagine it must take Frank a long time to tally the winners since he’s doing this solo. This is my first auction of his. Typically when do you find out if you won and how much is due?
Looks like they're up, now. I checked earlier and the page wasn't up yet. Off to see what Lot 312 closed for ...
Check @lordmarcovan 's post. I've only been in one FSR auction before but what he does is ship out the coins with an invoice, so you get the coins and the bill at the same time.