King has been mentioned twice in this thread. I have one of those rotary Kings (a 'pit' model) and it's quite clear that King had nothing to do with the manufacture of the rotors, which are obviously of European origin.Rick Denney wrote:.... The paddle arrangement is very similar to a pre-war King 1290, though the bell is more like the standard pre-war German kaiser tuba. If this one was made between the wars for export to the U.S., King might well have gone to school on it for its own model. The similarity in the configuration of the mechanism suggests someone went to school. It's not impossible that Alexander was copying the King configuration in order to appeal to the American market--as bad as it was in the U.S. during the Depression, it was worse in Germany....
At this point... if I had to 'guess'... I think the rotors on the Kings were probably manufactured by the same folks who made the Alex valves.


