Farmall or IH??

I have purchased a IH 686 diesel direct drive tractor. Or at least I THINK it is an IH. The body medallion is International Harvester. But the model/serial number plate says F686. The SN is U11975. It was new in 1979. I am confused by the "F" in the model number. Does that mean Farmall?
 
Think of it like this - General Motors - Chevrolet - Silverado (IH - Farmall - 686) If it were an International, there would be an
I where the F is.
 

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