Collect.com is offering a Stall & Dean Ty Cobb advertising piece in their upcoming auction, lot #2. They're pulling all the stops on this one as a quick google search reveals several videos and articles touting the piece and comparing it to Barry Halper's auctioned by Sotheby's. Please be aware that since the Halper auction, several reproductions have surfaced that contain all the same irregularities of the Sotheby's example except one. There was a crease on Halper's while all those offered since are cut differently, eliminating a portion of the original where the crease was.
In any event, there are a few long stories about the repros, which apparently originated from the Ohio area. Unfortunately, some people were fooled and are out big money. I handled two of the repros years ago, but thankfully wasn't taken for anything. Suffice it to say, if you're interested in this piece (in this auction or any that follow) do your homework and be aware that repros exist. The best starting point is to pull out the Halper auction catalog and compare them. Most of you will stop right there because you'll become immediately skeptical. If you end up purchasing one, take it to an expert in printing. The repros are easily detected by a trained eye because the original printing process isn't used on the fakes. Lastly, get the paper dated. The repros look old, weathered and original at first, but they're not. The best advice I can give, when going after a piece like this, is to know the seller's refund policy before making the purchase!