For those of you who do not know, Leonidas was probably one of the major "mega stars" of Brazil prior to Pele. (I would probably put Arthur Friedenreich, Domingas Da Guia, Jair and Zinzinho and maybe a few others on that list)
Here is a bit more about him. Credited with potentially being the creator of the bicycle kick and he was the leading scorer of the 1938 World Cup.
https://en.wikipedia.org/wiki/Le%C3%B4nidas
I am pretty sure that Pele would have been a collector of his cards/stickers as this would be in the 1940's when he was a kid. Anyway, enjoy these artifacts: