Are you sure it's a J?
My book says that stands for "various French company products"

X1J stands for "gasoline, 7-mph high-speed gears, 5,000-foot high altitude"

Ben
 
On Smokestak there was the same question regarding the J and the answer is found in Fay"s Farmall Letter Series book and it is for Rockford Clutch.

Later
 

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