Dealer Zone Reps handed out the order pads that were pre-printed with VON (Vehicle Order Numbers) on them. The pads would be consecutively numbered so if someone ordered a car from the same dealer around the same time of year then the numbers could be really close. Different dealers had different numbers and went thorough pads (sold cars) at a different rate so the numbers can be fairly far off. The later in the production year, the more the VON could be off as dealers use up their pads to order cars at different rates.