As I told before I am currently working on a book about the vienna "heumarkt" tournaments.
Alf wrestled in vienna 50, 52, 54, 60. He was named Nathan Rubinsohn and was billed from canada. It was written in some 1950 newspapers that he always wear a championshp belt when he comes to the ring. Any guess what belt this could be? Is this the belt Alf carrys in the A-Z section? Or was it maybe a belt from his boxing carrere. He was billed as "KO-King" and winns every match with a knockout punch.
Thank you
Probably the one he was often photographed with: Have seen it mentioned on wrestling bills as a "Belle Vue Belt" but I think it was from boxing as you mentioned.