HOW OLD IS YOUR ARMSTRONG EQUIPMENT

HOW OLD IS YOUR ARMSTRONG EQUIPMENT?

Serial No.	Built Between	Serial No.	Built Between
1 - 499	1919 - 1940	8,000 - 8,999	1969 - 1971
500 - 599	1940 - 1942	9,000 - 9,999	1971 - 1973
600 - 699	1942 - 1944	10,000 - 10,999	1973 - 1975
700 - 799	1944 - 1945	11,000 - 11,999	1975 - 1977
800 - 899	1945 - 1946	12,000 - 12,999	1977 - 1979
900 - 999	1946 - 1947	13,000 - 13,999	1979 - 1981
1,000 - 1,999	1947 - 1949	14,000 - 15,999	1981 - 1985
2,000 - 2,999	1949 - 1952	16,000 - 16,999	1985 - 1992
3,000 - 3,999	1952 - 1955	17,000 - 17,999	1993 - 1997
4,000 - 4,999	1955 - 1958	18,000 -	1998 -
5,000 - 5,999	1958 - 1962
6,000 - 6,999	1962 - 1967	20,000 - were reserved for PRO-Filers, PRO-Filer IIs, SidePros and Levelers starting in 1992
7,000 - 7,999	1967 - 1969