In 1953 Vincent Bach moved his factory from New York City to Mount Vernon, New York. In 1964 Bach retired and the company's new owner, Selmer Instruments, moved production to Elkhart, Indiana.  Bach Stradivarius trumpets made in Mount Vernon are especially prized by collectors and musicians who say that these Mt. Vernon horns are the finest Vincent Bach ever produced. If you want to see if your vintage Bach Stradivarius is a Mt. Vernon model, check the second valve casing for a manufacturing stamp that lists "Mount Vernon, NY" along with the bore letter code and serial number.