It's a Buescher model 1054 with a manufacture date from around 1966. Most closely related to the Elkhart Band Instrument Company (EBIC) 30a from the late 50's, though that particular brand was eliminated in 1961 -- pre-buyout. Buescher started labeling the EBIC horns as Aristocrats beginning in 1961, essentially turning the Aristocrat brand from a what had been a pro-level instrument to intermediate (for the time). Think of it as the YTS-52 of its day. Fundamentally the same instrument with a few less features was also produced with Bundy branding -- the "student" line. I have no idea if the Buescher-branded horns were made any better, but I doubt it. That said, the basic design was solid, played in tune, excellent Buescher tone (in the hands of someone that knows what they're doing), and was well proven and the favorite of most school band directors in the US, even if they didn't feel all that great under the fingers to advanced players.