This card is clearly signed by Joe Mauer because if it is a fake signature like on the 2007 and 2008 Topps cards none of the signature is on any part but the picture and on this card part of the signature is on the white area with the players name on it.
This card is clearly signed by Joe Mauer because if it is a fake signature like on the 2007 and 2008 Topps cards none of the signature is on any part but the picture and on this card part of the signature is on the white area with the players name on it.