Very hard to find collectible Robert Tyre Jones Jr Medal: This outstanding, Grand Slam silver medal commemorates the 1930 Bobby Jones wins of the British Amateur, British Open, United States Open, and United States Amateur, all in the same year (never done before by anyone). The medal is 1.5 inches in diameter and weighs 27.25 grams of .999 silver. "The Metal Arts Co. Inc. ROCH NY .999 Silver" is engraved on the outside rim of the medal. The front of the medal has a facial bust of Bobby Jones and Robert Tyre Jones Jr - Bobby Jones on the perimeter of the medal. The back has Bobby Jones putting with Grand Slam 1930 and a list of all four tournaments on the perimeter. This is an awesome golf medal for anyone's golf collection