I have an instrument that is labeled as a Conn, Elkhart, Indiana which has a serial number that places its manufacturing date as 1918 or 1919. I have looked at a lot of examples and can't really tell if it is a baritone or euphonium, since Conn seems to have used the terms interchangeably. If anyone can help, I would appreciate it since this is my first euphonium (I play trombone). Thanks.