Anyone interested in watching a replay of the live bidding on the 1870-S half dime at Session 2 of the FUN US Coins Signature Auction #1356, here's the YouTube link. See portion from 53:45 to 58:25 of the video clip. Winning bidder was Bidder 601. I have no clue who that was.
Out of curiosity, how do you know that Bidder 601 was Heritage? I know that the terms and conditions for the Heritage Signature auctions allows Heritage, or its employees, to bid on those auctions, so I'm not questioning whether Heritage can do so. More curious on how you associated that bidder number with Heritage. Thanks in advance.
It's good to know the sort of games Heritage plays with these, not that they'd be doing the same on anything I'd be bidding on. I think the seller can bid too, they just have to pay the juice if they accidentally win it. I could be wrong about the details on that. The 1870-S $3 is clearly a Details coin to any of us mere mortals, but being the only one available it probably doesn't matter what's on the slab.
Heritage has done some not good things in the retro games markets so doesn't suprise me https://kotaku.com/youtuber-accuses-million-dollar-retro-game-sales-of-bei-1847557296