VON has to do with the ordering process and not the date the car was scheduled to be built. VIN and SPD will correlate, but the VON will vary based on how and who ordered the car. Dealership were given order form packets from the district managers for each new production year and they were pre-printed with the Vehicle Order Numbers (VONs) to help track the order. So if a smaller dealership got a low number packet and goes through less forms it can very easily order a car with a low VON several months in to production. Only one package started with VON 000001. Many dealerships got VON's with much highers right from the start of the ordering process (early cars). So it's not uncommon to see early built cars with high VON's. There is a pattern though. I have documented 000XXX VON's on December built cars.
