Fender American Vintage Reissue Stratocasters have serial numbers that begin at V000001 in 1982 and are now approaching V200000 in 2008.
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From my experience, any serial number below V016000 denotes a guitar made at the fullerton plant (1982-1984).
Of course, there are exceptions to this generalization.
I have come across many guitars with a serial number in the V012000's with a 1982 neckdate.
I have also come across guitars with a V012000 serial number with a 1986 neckdate.
A possible explanation is that Fender just had a large box filled with neckplates and thus placed on guitars in a semi-random fashion.