I have
had some uncleaned silvers with this hard
red encrustation and it is really hard to remove and the end results are usually really badly corroded
pitted coins. I think they have already been processed in acid which is why the bright silver edges show, but the acid will not cut this nasty
red crust, at least not quickly, so I would guess he gave up at that point and listed them as uncleaned. I don't see any reason to doubt these coins, but if the seller is on the NSFL then I would not support them any way. though as mentioned below, I would be interested in the details that got them added to the list, as most of what they have seems OK.