The Model 65 was introduced in 1974. The serial number should have a "K" in it. For example: 4K54,105 - 4K99,999....1974
5K73,963 - 6K58,917....1974
7K1 - 7K26,043.........1974
7K26,044 - 7K70,577....1975
6K98,918 - 8K20,763....1975
8K20,764 - 9K1.........1975
8K20,000 - 9K100,000...1975
9K1,001 - 9K99,999.....1976
10K001 - 24K9,999......1977
25K001 - 56K9,999......1978 - 79
57K001 - 91K6,800......1980
91K6,801 - 124K000.....1981
125K000 - 269K9,999....1982
270K000 - 311K273......1983
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