This is a 1928 vintage C.G. Conn F Alto (often called a F Mezzo Soprano), serial number 213763. This horn features its original "silver & gold" finish, which featured a silver plated body and gold plated keys & inlayed engraving. This was a standard option finish available in its day (option # 1 in the Conn catalogs) but you don't see it very often. A very unique look! On display in the Saxquest Museum in St. Louis, MO.