This item is a sheet from Practice Day on April 7th 1998 which Augusta designated as "Jack Nicklaus Day" to mark his 40th appearance. The sheet is signed by a number of Masters winners:
Tom Watson
Fred Couples
Ray Floyd
Ben Crenshaw
Herman Keiser
Gay Brewer
Doug Ford
Bob Goalby
Jack Burke
As well as others including David Duval and Steve Elkington
The sheet comes with a letter of authenticity from James J Spence.
This would be a lovely addition to anyone's Masters collection.