Originally Posted by BobbyOne
I don't have the references to your indications above. However, rather than Berlin being vaguely the 'World Pro Championships' - it was universally and unambiguously regarded as such. Your above mentions maybe some promoter 'talking up' the event (though it was reasonable to call the Wembley event the World Pro indoor). In contrast universally Berlin in 1932/33 was called and regarded as the World Pro. It was a major at the time, regarded by all as such.
timnz, there are newspaper clippings about those maybe strange championships.
Hans Nüsslein used to claim that he won three world pro championships: Berlin 1933, Paris 1936 and Wembley 1937