VW did,nt start calling the Type 1 "Beetle" until the GT Beetle of 1972/3 I believe but the first VW owners club mag was called BEETLING and the name stuck.
As for the year of manufacture.
Your bug was REGISTERED in 1964 even tho it was BUILT in October/November 1963.
Also some dealers would have had stock from the previous year.
My 1970 is in fact a 69 in spec.
It was registered Aug 1 1970,so is a 69 Beetle,being BUILT in May 1969.
Confusing I know but just remember the motor industry runs August to August,at least in UK and Germany.
Hope this is some help.
If you REALLY want the history of your Beetle,VW will give you a history for a fee.
RALPH.