Offered here is Billy Casper's personal tournament-used 2 iron from 1968. According to the letter of provenance that comes from Billy Casper Golf, this club was being stored in Billy Casper's home office. The letter (signed by Billy's son Byron Casper) states that this club was likely used in "at least one" of Billy Casper's 6 PGA Tour victories in 1968. This makes sense considering it was stored in a prominent place in Billy Casper's home office five decades later.
Letter of Provenance from Billy Casper Golf