In his biography "Ben Hogan, An American Lifve," James Dodson says the shot was hit with a 1-iron, which was stolen after the round, along with his shoes.
"....there were some who later contended that the missing club was actually a two-iron Hogan fired so exquisitely to the final hole. Hogan himself said as much in 'Five Lessons,' the famous instruction book he later wrote with Herbert Warren Wind, although Hogan eventually insisted that the club had been a one-iron and the copy in the book was a typographical error. George fazio, for one, who stood nearby in the gallery and watched Hogan execute the shot, always maintained it was a two-iron he used, and so did veteran New York sportswriter Al Laney, who was also standing near the scene. Many years later, a member of Shady Oaks Country Club also swore Hogan personaly told him it had been a two-iron. Future USGA President Bill Campbell, on the other hand, who was in the gallery directly behind golf's most mythical shot, says there's no doubt that it was one-iron.
"In hopes of clearing up the confusion, Merion members eventually wrote to the man himself, asking for clarification on the club he used that onforgettable afternoon, as well as for better particulars on how the club and shoes were wandering off into the mists of legend. Hogan wrote promptly back to the Merion membership: "It was a one-iron I played to the 72nd green. After hitting my shot, my one-iron was stolen. I haven't seen it since. Also, that night my shoes were stolen out of my locker and I haven't seen them either."