Production dates(sourced from an ex Quad employee) are as follows:

Number              Year of Manufacture
     1-2000          1958
  2001-4000          1959
  4001-6000          1960
  6001-8000          1961
 8001-10000          1962
10001-12000          1963
12001-14000          1964
14001-16000          1965
16001-18000          1966
18001-20000          1967
20001-22000          1968
22001-24000          1969
24001-26000          1970
26001-28000          1971
28001-30000          1972
30001-32000          1973
32001-35000          1974
35001-38500          1975
38501-41000          1976
41001-44000          1977
44001-47400          1978
47401-50300          1979
50301-52100          1980
52101-52800          1981
52801-53000          1982
53001-53150          1983
53151 - end          1984