I've posted a picture with IDs in the Billiard History forum:
http://forums.azbilliards.com/showthread.php?p=5835028#post5835028
http://forums.azbilliards.com/showthread.php?p=5835028#post5835028
It depends on which sanctioning body you want to follow, I suppose. The BCA event was a professional championship while the 1952 World Championship that was held in Argentina and won by Pedro Leopoldo Carrera (Arg) was the amateur championship, sanctioned by the predecessor of the UMB, the Union International des Fédérations d'Amateurs de Billard (UIFAB). The UMB was founded in 1959. Until about 1990 a major goal of the UIFAB/UMB was Olympic Games participation and at that time all Olympic athletes were amateurs (cough, choke, sputter....), so it was necessary to have an amateur organization. The split between pro and amateur continued until the BWA forced things around the time that pros in general were allowed into the Olympic Games. Along the way there was talk about excluding Raymond Ceulemans from the World Championship because he was not amateur-pure.very neat, hoppe with masako who was a female carom exhibition player of all games, i read that crane actually beat her, had no idea otherwise he was a talented 3c player
side note i wonder why on wikipedia it says there was no world championship held in 54 when thats the yr worst won it in argentina
Along the way there was talk about excluding Raymond Ceulemans from the World Championship because he was not amateur-pure.