On my '65 their is a duplicate VIN stamped on the top of the frame rails in front of the motor mounts.
1960-66 the first digit tells the year:
"0" = 1960
"1" = 1961
"2" = 1962
"3" = 1963
"4" = 1964
"5" = 1965
"6" = 1966
1967-1972 the fifth digit tells the year:
7 = 1967
8 = 1968
9 = 1969
0 = 1970
1 = 1971
2 = 1972
Hope that helps
