From August 1971, this engine was used in California delivered cars. Had to do with emmisions.
1971
F0 1966/67 1300cc
HO 1966/67 1500cc
F0 1966/67 1300cc
H5 1968/69 1500cc
to find the year, you need to know the letters prior to the number
1600cc from Model Year 1971 - www.lennysvw.com
This would be model year 1963.
you need to have the letters that come before the numbers to find that info
H 1965 1500cc it came out of a type 2
August 1966 thru July 1967, 1500 cc, 53hp
AE 1971/72 1600cc - dual relief, dual port