This one hits all the key elements in the description: grandfather, attic, "no idea if this is real or not". Yet it's the most hilariously obvious fake I've seen in a while: red Old Mill back, wrong font on the front, beaten up to look old. It's like the fakers aren't even trying any more. Yet it looks like some sucker is willing to pay $61 for it as I write this.
http://www.ebay.com/itm/Ty-Cobb-1909...d/111674546548