Seriennummer - W. T. Armstrong
Flöte und Piccolo
| Serial Number | Year Manufactured |
| 18,000 -- 67,000 | 1949 -- 1965 |
| Prefix A, B,C (omitting H, I, O, Q, W, Y and Z) | 1965 |
| Prefix R Series | 1970 |
| Prefix V Series | 1972 |
| Prefix 1, 2, 3 | mid 1972 |
| Prefix 3 thru 9 | 1973 |
| Prefix 24 Series | 1974 |
