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The engine serial number, which should match the chassis serial number if the block wasn't changed out, is stamped at the top right on the side of the block. Look below the number one plug and you should see a spot that's been machined flat. The number is stamped there. It may take a little doing to read it. Likely dirty and the rod to the governor is kinda in the way. Next step would be to look around the tractor for any date casting codes. These aren't the ones that end in D or R followed by a digit. They are #*#*X, #s are one or two digits, X, is a letter. For Bs, the letter could be anything from I to Q. The numbers are day and month, the letter is the year. My 47 BN has Ps and Qs, meaning it was assembled from parts that were cast in 1946 and 1947. Look up the serial number you find in the table on the left of this page, and, if it matches up with any date codes in the castings, most folks would take that as a pretty good verification of its age.
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