I may have the opportunity to buy an "F. Besson - Kanstul" horn at an extremely reasonable price but I'm looking for more info on it. On the bell it say "FB, Systeme Prototype, Paris - France, Meha, F. Besson, 66 Hautes Recompenses, 6 Grand Prix, Hors Concours, Membre Du Jury". The valve body is stamped with serial # 4366, and "F. Besson, Kanstul". Can anyone provide me with info on this trumpet. Actually, i'm not sure if it is a Bb or not. Thanks!