Seriennummer - William Frank Company
| 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 | 1945 -- |
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