This is a personally used Billy Casper Wilson 1 iron. This Wilson Dyna Power Staff Model 1 iron is stamped Bill Casper Jr. and was produced by Wilson in 1957-1958. Original shaft and leather grip. Though it is nearly impossible to verify at which tournaments a club from this era was used, it is important to note that Billy Casper won multiple PGA Tour events when this club would've likely been in his bag. He also won the 1959 US Open at Winged Foot, though it is not clear if he would've received a new set from Wilson before that tournament.