I was reading a boxing bio from the 1960's and in it stated that only 3 HW's have fought in all the weight divisions as professionals Can you name them???!!??
Yeh as demps stated, Carpentier started off at flyweight as a teenager and grew all the way to heavy, I am sure there was a fighter that fought in the 20's and died before he peaked, whom had fought in every weight class and had about 200 odd fights, I'll go find out
I thought I once heard Young Stribling. Did my memory betray me? What about Tommy Farr or Len Harvey?
Harry Greb was never a flyweight. Battling Levinsky is my best guess lol. but he was never a flyweight either.