You say "Educated guess after he studied the shipping records)that were equipped with industrial features; and that only one of them is known to have left the factory painted green"
Knowing JR and having a 30 series serial number register, they did not keep color codes on any of the waterloo built tractor. This one that JR mentions likely isn't yours because there is nothing that makes your tractor special in the register. Unless he knew of your tractor before you bought it, I would bet there is at least one more that JR knew of. Lets not forget you are quoting a 13 year old article. "Could this one be the earliest one built or known remaining and could it be the green one that J. R. Hobbs wrote of? Seems possible to me"
So you are saying this may be the earliest one, if you use the argument that there are 24 with industrial features in the first 1400, then logic says that there are almost 2 in every 100 serial numbers so your would be at least the 4th or 5th built. "There is NO doubt in my mind that the tractor we are offering was painted green on the assembly line, nor do I have any doubt that it was wearing Industrial accessories, options or heavy duty parts if you wish, when it came out of the plant for delivery." What industrial parts does it have besides the frame. These frames broke and were replaced often. There was an 820 that yellow from the factory that sold at Polk's labor day auction that had a green frame on it. There was no question that this was yellow from the factory and had the frame switched. Could your frame have been switched? What is the casting code? Could the tractor just been a green one that had the frame broke and switched with an 840 frame then painted yellow?
"One additional question? At what S# did the "I" actually show on the serial plate of the 830 industrial tractors? Was told that not all tractors had an I on the tag." Even a true 830I did not have an I on the tag.
I think you read an article and you are trying to make this tractor fit into JR's description. I think you need to talk to Jack Cherry at the two-cylinder club.