Bach professional b flat trumpet has a .499 inch medium-large bore along with the 37 bell
No other part numbers with same form, fit, and function found.
Classification: Brass-wind instruments
NSN 5935-00-772-0499
NSN 6145-01-054-6022
NSN 6240-00-017-9006
NSN 2925-00-001-4604
NSN 5835-01-631-3940
NSN 5915-01-580-0308
NSN 6320-01-436-0513
NSN 5855-01-147-6024
NSN 5855-00-451-6155
NSN 6620-01-318-8314
NSN 6150-00-719-6119
NSN 5975-01-287-1341