According to my search the following horns were made around 1963. I'm looking for comments, information, and input from the TM community. None are fabulous playing or sounding horns except for the Buesher and Martin. The Holton is interesting because it has a hand made look to it. Here's the list with serial numbers: The Martin Imperial Elkhart Indiana USA # 708027, Frank Holton & Co. Holton Collegiate Elkhorn Wis. USA #363356 (this horn is interesting because it has hexagon waterkey stems and Pearl valve buttons), DN Noblet Paris #M 10117 (2nd valve case has MADE IN FRANCE and each valve case is numbered 34 35 36, Elk Hart Built by Buescher Elkhart-Ind.-USA #481519.