Armstrong 序列号
| Serial Number | Date |
|---|---|
| 字首 "24" Series | 1974 |
| 字首 "3" to "9" Series | 1973 |
| 字首 1,2,3, etc. | mid-1972 |
| 字首 "V" Series | 1972 |
| 字首 "R" Series | 1970 |
| 字首 A,B,C (minus H, I, O, Q, W, Y & Z) | 1965 |
| 18,000 - 67,000 | 1949-1965 |
从1974年至今-前缀数字加50将为您提供生产日期。
例如，序列号24-58637 = 24 + 50 = 1974
