If that data plate was raised letters and gives the size information as you mentioned, it's most likely a former military tractor, I have one with the plate you describe in the same location and another with a brass army corps of engineers tag on the firewall behind the air cleaner, a different kind of tag. This embossed tag is put on for military information, and is not the serial number tag placed by the manufacturer. Yours is may be a 7M, 3T, 4T, or 6T model of a D7, they even made an armored 1T in limited quantities, and in all, there were about 50,000 manufactured, these are practically identical, only differences being subtle upgrades, that parts catalogs will only reveal by serial number and higher gear ratios in the transmissions for ones obtained under government purchase order, like 4T's and 6T's (which only 1000 6T's were built for the navy). I'm thinking you may have an early 3T, the government needed all these they could get for the war effort back then, so they even bought some 3T's which were for sale to the public, and even although they had already bought 10,000 7M's and 10,000 4T's the next series up from 7M, both an exclusive government order, painted O.D. green at the factory. Later after the war, a lot of these were surplus, some stayed in assigned units and became surplused later, there are still many of these in other countries, and quite a few dumped into the ocean, government was not too bright for doing that.
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