EuroBasket
I see your also a fan on the EuroBasket, In fact the first championships for the eurobasket were held three years after the establishment of FIBA way back in 1935.
Who played?
Well Switzerland was chosen as country to host the game, and after that ten other countries joined as far as I know. 
Which ten?
I'm not really sure sorry, But I love to see how your a huge fan. 
I just want to go play there myself
EuroBasket
EuroBasket, also commonly referred to as the "European Basketball Championship", is the main international basketball competition that is contested quadrennialy, by the senior men's national teams that are governed by FIBA Europe, which is the European zone within the International Basketball Federation.
History.
History Beginning.
The first championships was held three years after the establishment of FIBA, in 1935. Switzerland was chosen as the host country, and ten countries joined. Only one qualifying match was played between Portugal and Spain. With
EuroBasket 1935
The 1935 FIBA European Championship, commonly called EuroBasket 1935, was the first FIBA EuroBasket regional basketball championship, held by FIBA Europe, as well as a test event preceding the first Olympic basketball tournament at the 1936 Summer Olympics. Ten national teams affiliated with the International Basketball Federation (FIBA) took part in the competition. The event was hosted by Switzerland and held in Geneva in May, 1935.
The 2012 Latvian film "Dream Team 1935" is based on the events of the tournament. It tells