Serial Number
Year Manufactured
Excelsior or Frank
6600 - 10,000
19?? - 1938
Excelsior and American Prep
1000 - ??
1942 - 1945
Frank
10,000 - 15,000
1945 --
American Prep
100,000 - 112,000
If you note any discrepancies, or have additional information concerning this company, we would appreciate it VERY much if you would pass it on to The Music Trader. Thank you!