X1 and X1A serial #'s and low gears

There has been some discussion lately in the pulling forum about low gear H's with a X1A at the end of the serial number. My Dad and I are working on a '49 M right now so I decided to check and it ends with "X1". Can anyone shed some light on this?

Thanks
 
Here is a copy of the X codes for Farmall M's from a service manual.

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