That includes cornets, trumpets, horns, trombones, euphoniums and basses.This list is not correct for Conn saxophones (see Conn Woodwind Serial Numbers) or Conn bugles (see Pan American Brass Serial Numbers).Other ancient trumpets have been excavated in Asia, South America, and Scandinavia.
Metal trumpets were made as early as 1500 BC, as both bronze and silver trumpets were unearthed in King Tut’s tomb.
Current thinking is that these marks indicate a non-standard alloy, probably only of the bell.
The suspicion is that a star indicates a gold brass bell (higher copper content), while a "B" indicates a "French brass" bell.
Before that I had a Sonata by K & H as well as a Getzen Eterna "Doc Seversinsen".
It is from my point of view an absolute Leadtrompete with which one can "popping" if necessary.