Aquellas trompas de campeonato en Bilbao
The contest was organized by a sports newspaper Excelsius from Bilbao (Basque country) and took place for several years in the 1930's. The competitors were between 7 and 14 years old. There were two competitions. The qualifier was a contest consisting in pushing with the top a copper coin or flattened bottle cap in a race, called "caminata" (walk). The best six went to the finals, that consisted in removing coins from a circle, called "a corro".
Many details of what happened in one competition are given in the article, including the name of the winner, second place and the first qualifier, plus cheating attempts, etc.


Apparently, somebody is planning to organize a similar contest in November, restarting it after more than 90 years.
I've just found out that the Excelsius (1931-1937) is available digitally.
PS: The name used in the 1930's newspaper was Trompa (the newspaper was in Spanish not in Basque language). I wish Trompos Cometa had used the name Trompo instead of Peonza during it's campaigns in Spain.