Fender's production methods from the early fifties had the effect the numbers may not be consecutive.
Also overlap of serial numbers and dates come with regularity.
Only the seven-digit suffixes were actually entered into the database.
Where to find the serial number The serial numbers on the guitar are provided through the years on various places.
At the top of the neck plate, at the front or at the back of the head or on the cover plate of the vibrato.
So, obviously a neck date, while being helpful in providing a date range of production, it cannot be a definitive reference.
Unlike the auto industry which has specific model years for their products, most specifications for a given Fender instrument model, change little if any, through the lifetime of the model.