According to the data I have here, serial number 213 799 was originally built as 213799-665, a 2150 with front wheel assist and the extra heavy duty final drive option, on February 17, 1969. But your model number off the tag tells me that it is a 2050, two wheel drive. (All of the two wheel drives used the planetary finals drives.) That's about all I can tell you from here.

If it were my tractor, I would call the Floyd County Museum at (641) 228-1099 and buy a copy of the build card for that tractor. Could be the factory pulled a 2150 back in and converted it to a 2050 in order to fill an order, and the build card would most likely have some kind of note to that effect on it. If that is the case, you might have the last 2050 built. 

If you do get that build card, let me know what all it has to say. I'll be looking into it next chance I get.