[Starting in August 1964 (1965 models) VW started to use a nine-digit chassis number. The first three numbers give information about the kind of vehicle it is and the year it was made and the last six numbers are the chassis numbers. At the beginning of each model year (August), the last six digits start with 000,00 1. For example: 316,050,000 means a Type 111, 1 stands for sedan or fastback and the 6 for 1966, the 50,000th made that year.
Go to
http://www.bentleypublishers.com/features/gvsw/GVSWspotters.pdf
You may be able to work out your variant from there..
Good Luck
Rob