The second line under engines for each year lists Mod M under Model, but the column under tractor is blank.
Further down, they list M (way down below MVs, MDs . . .) in the Model column and FBKM. That's where the overlap is, between the Mod M with the blank column and the M under Model with the FBKM in the tractor column. Which one was the M???
It's those two sets of number, both identified as going into Ms (in very similar quantities) that overlap.
That said, I'll eat some crow and allow that the motor in question is from late '51, and can only speculate that the memo from March '52 authorizing the FMBK prefix could have been a retro-active affair as the records indicate the prefix and even the numbers in the memo predating it by fifteen months at least. Very odd.
But again, we still have two sets of serial numbers for motors on Ms during this period, and the two motors have different spans between the first number of successive months, precluding any conclusion on a chassis number based on the engine number.
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