ALLIS-CHALMERS model M crawler

[J. Wright]

I just purchased an A/C crawler. Where do I find the serial number and how do I decode it for the year identification.

 

[TomA in CA]

The serial number is stamped on a flat surface on top of the transmission near the shifter or steering clutches. I have one down in the yard, I will check tomorrow and describe the location more precisely.
Good tractors.