Armstrong

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

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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