The numbering started at 1001. Just subtract 1000 from that number and you have the sequence number of the vehicle. I'm not sure if the number represents just the 3600 model, all trucks or all vehicles produced at that plant in September of 1948 but it would be the 3500th of one of those.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.