| Serial Number | Date |
| Prefix "24" Series | 1974 |
| Prefix "3" to "9" Series | 1973 |
| Prefix 1,2,3, etc. | mid-1972 |
| Prefix "V" Series | 1972 |
| Prefix "R" Series | 1970 |
| Prefix A,B,C (minus H, I, O, Q, W, Y & Z) | 1965 |
| 18,000 - 67,000 | 1949-1965 |
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Note: From 1974 to present - The prefix number plus 50 will give you the date manufactured. For example: Serial# 24-58637 = 24 + 50 = 1974 |
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