Pan-American was a student line of instruments made by the parent company Conn. They are ok horns, similar to the equivalent Conn of their era but lacking rolled tone holes. But not worth putting a lot of money into, unless you can get a repad done really cheap. The patent date was stamped on all those horns, A is for alto sax and L is for low pitch (A=440), but the serial number P10689 doesn't really tell you when it was made, as the Pan-Am horns did not follow Conn's number system.