First off, the Pan-American is a Conn without rolled tone holes and was discontinuted in 1955. If it has the soldered tone holes (youwill see a solder line where the tone hole meets the body) it would be a Martin, Indiana, Courturier or Lyon & Healy. Are the bell (B&Bb) keys on opposite sides or both on the left? What is marked at the serial number area. If it has a 1914 or 1915 patent date, it has drawn tone holes.