Two obvious markers that yours MAY be early(Hedging bets as lots were rebuilt, so have bits from various vehicles) No gap between front of body and cab, no sides to the seats. The other thing is is the fuel filter reccesed, early or stick out later. Voltage is also a maybe, 6 volt tend to 12 volt later. The other give away is very early had a Dodge name plate on the front of the radiator cowl. Gordon's site the Dodge Forum has a list of know serial numbers against date of production. You may, there seems to be some confusion as to the state of the musuem at the moment, get a copy of the build card, or at least to a week, the date of production, cost $25 and produce proof of owner ship. Worth e mailing first and they wil tel you what records are there, then on payment they send you a copy. I'm lucky both mine have Chassis number to the day of production, again, but after 70 plus years a lot of rebuilds and service don't be suprised, in fact be very suprised , if all the numbers match. there should also be a body plate. What's important is that they are a hel of lot of fun to won, drive and show. You are priviliged to have in your care a pice of equipment that was built to serve the men who used them in action to the best of the ability of all the people who produced them. You never own a military vehicle, you are the current custodian of a historic pice. ENJOY her. :-D
Quick check, 817 puts her towards middle of 1944, so she has probably had a major rebuild somewhere in her life.