This official pin flag from the 2012 Ryder Cup at Medinah is autographed by the entire American Team with the exception of Tiger Woods.
Here is a complete list of autographs:
Davis Love III (Captain)
Phil Mickelson
Dustin Johnson
Zach Johnson
Keegan Bradley
Jason Dufner
Matt Kuchar
Webb Simpson
Brandt Snedeker
Steve Stricker
Bubba Watson
Jim Furyk