I could see it going XF-AU, and it appears genuine, but it is very obviously cleaned. I've never bought from Denver Coins Co, but I've seen a bunch of their listings and it seems to be, and I'm certain is, too good to be true. I could be paranoid but I think the first suspicion is that they start at $0.99.... while it can be good to increase popularity with more bids, they are also taking a HUGE risk on something like a 16-D, as even in P-1 it is still a good $500 coin. $2475 is not that bad of a price for that coin, but it still has 5 days to go and will likely become an element of unobtanium by the end.
This recent thread might be the one you guys are thinking of. @ddddd sleuthed out the GC sale of a Details 1902-S $1 that was cracked out by this seller and resold. https://www.cointalk.com/threads/question-for-experienced-coin-graders.420878/#post-26649199
I suppose the fact that some people indeed would, however, is likely what this seller is counting on, playing the game with the crackout of problem coins and resale of them raw. I suppose it's kind of a grey area, ethically speaking.
A Raw 1916-D should have 20 pictures in the listing. That's one of those coins that you should buy graded authenticated. This company has a certain business model that plays on buyers emotion. Results speak for themselves if you look at the sold listings.
Here's another one. They have been selling a lot in cardboard holders with red markings to accent the "deal". I think old holders often have rusty staples. What ya think? Ps..look at "sellers other items" https://www.ebay.com/itm/397536953159?_skw=1916+d+mercury+dime+pcgs&itmmeta=01KG28T1EBA9RC767JXZK2D3YW&hash=item5c8f0c8347:g:RqEAAeSwq~ppdvOm&itmprp=enc:AQALAAAA8O7PUuNWmJ++UShgI9tQz/pHQmX9WdGpU/rYsl/vnOAKA88va2bYOwjqc5CauL0ztQEFVZxAwuHhx9Tun4asKw/BfDcYxHGyKEFhGJpupioFbyz8lWkjx/VHd46wmyqKGLFCuCUHS9uytzpsxQcaxX8ENqEsTETPg7/Gsxr3g6QatcfFHhgL7ZdOw6UN+dvtYDTzmeVS6HFT0tQTVZm6UVA7+iyFAli9EB1DpTw4Xhzo/V3JGsPmH4gWc5QexftutiWe9fxySiBgAMDUHwYxgjRVxzlqlGjjmmYQwp0uog9UofG4phFAKDzprDxA78dkGA==|tkp:BFBMqpfoyIBn
Whoo, though high grade in details (assuming it’s even genuine), that one’s been cleaned to hellenback, ain’t it!
Hum, so someone cuts a detail coin out of a holder (after purchasing it, say for 1000) Then modifies it and puts it on e b y. Now suppose the highest bidder is 900 at 1 minute to go. Here's when the seller has one of his buddies bid 1100. Seller gets the coin back and his buddy gets his 1100 back. Seller is out a few bucks that e b y keeps and possibly taxes. But if the bidding goes to 2000. Sick.
If you look at the other discussion I linked above, they bought it for $461, cracked it, juiced some photos and sold it for $900. Quite a racket.