Serial numbering didn’t change immediately because instruments continued to be made using existing, tooling, parts and serial number schemes. The chart below details Fender serial number schemes used from 1965 to 1976.
Fender Serial Numbers, 1950 to Present (Identifying the Year). Serial numbers compiled from several sources including myself, Gruhn, and Duchossoir.
May 18, 2010 - The chart below details Fender serial number schemes used from 1950. VN(XXXXXX), Korean-made Fender/Squier guitars (dating unclear).
Some Squier IIs were made in India around 1989-1990. The head stock is marked 'MADE IN INDIA'. Made in India Squier IIs seem to follow the made in USA serial numbering scheme. For example, a 1990 made in India Squier II serial number would start with N0 plus 5 digits.
6/24/12 Squier. Using Fender Guitar Serial Numbers to determine the date of manufacture. Fender Serial Numbers, 1950 to 2007 (Identifying the Year).