It's an alto (I know that much). It says Signet on the bell, and below that it says The Selmer Company, (below that U.S.A). The serial number on the back is 7900XX (not sure if there's any reason to, or not to, publicize all 6 digits).
Can anyone help me get an idea of the value of this horn? And/Or point me in the direction of where I could get an idea? If I could get multiple quotes that would be amazing. Thanks.