This 2000 Open Championship flag from St Andrews is autographed by 17 Open Champs including Tiger Woods, Jack Nicklaus, Sam Snead, and more. Here is a complete list:
Tiger Woods
Jack Nicklaus
Arnold Palmer
Sam Snead
Greg Norman
Lee Trevino
Nick Faldo
Gary Player
Bob Charles
Mark Calcavechia
Tom Lehman
John Daly
Nick Price
Justin Leonard
Ernie Els
Mark O'Meara
David Duval
Letter of Authenticity from James Spence Authentication (JSA)