Serial numbers

Pat H.

Member
I need a little help with serial numbers. I believe I know how to use the sidebar for serial numbers in YT but I have three I would like some elaboration on: All are Farmall M's:

121493XI

FBK233423XL

BK23250

From using the Serial Number sidebar, I believe the first to be from 1947 production and the next two from 1950, but I would like some help with the prefix letters and following letters. Could anyone help me or direct me to the solution? I would appreciate it.
 
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