Hy TonofFun, according to my truck sales data book for 1959 "Apaches are series 31 to 38. Medium duty Vikings consist of Series 40, 50 and 60. Heavy-duty Spartans include Series 70,80,90 and 100. Series 50, 70 and 90 are Low Cab Forward models, sometimes abbreviated as "LCF" models." Hope that helps.
That's what I'm finding as well, but I have no way of distinguishing between a 3800 Apache or a Viking 40. I looked again and there are no more numbers or data plates. But, the overall length is around 212" and the tires are 8R19.5. I also counted the leaves in the rear end and I have 8 primary and 8 relief, but I do know that a few have been added.
