Yeah, I sent that to Bob. 🙂 Valencia, 1951.
In 1951 Gilbert Leduc (c) vs. Rene Ben Chemoul matches for the (FFL) World Welterweight Title took place in France, Spain, Germany, Morocco and possibly elsewhere too. The year prior Leduc had become the first Frenchman to win a catch World Title in France and by the looks of it Goldstein was using his influence to get Leduc featured as World champion in as many places as possible.
That wasn't Quasimodo (Victor Castilla). That was Eduardo Castillo, who was actually a bigger star than Victor Castilla in Spain.
Yep, Salvador Font. Also notice Cabeza de Hierro (Jose Tarres) in the semi-main.