The Surfer's Cross is used by surfers as "a good luck symbol". Its origins are in 1960s surf culture and the most common design is based on a German Iron Cross but features a surfer on a board in the middle of the front side of the cross. Initially, young surfers wore genuine Iron Crosses, but "in 1965, the famous custom car designer Ed "Big Daddy" Roth unveiled his Surfer’s Cross pendant—a replica of the German military bravery medal". Roth also sold various "surfer accessories" that were based on other WW 2 German items, like his "surfer's helmet" that is a plastic copy of a German helmet. By 1966 Roth claimed to have sold 51,800 crosses and "that Hitler did a hell of a public relations job for me."
References
Surfer's cross Wikipedia(Text) CC BY-SA