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M serial number

The engine serial number is stamped on a flat spot on the block, just below and maybe slightly to the rear of number one spark plug. Usually that number is the same as the chassis serial number.
 

That's not entirely true. The numbers WERE the same for a while back in 1939, but the engine serial numbers also include replacement blocks, power units, and combines.

The best you can hope for is the engine block number being CLOSE to the tractor's actual serial number. If the engine block was replaced, then it'll be way off.

To get the tractor's actual serial number without the original tag, you would need the paper trail back to the original bill of sale to the original owner.
 
Also, there are casting codes all over the tractor. You will find them on virtually all of the cast iron parts. The codes will tell you the day, month, and year that particular part was made. The codes will not all be the same, but they should be within a range. If the casting codes are reasonably close the engine serial number, then it is safe to assume that the engine block is original to the tractor, and probably is the same as the chassis number.
 
To get the tractor's actual serial number without the original tag, you would need the paper trail back to the original bill of sale to the original owner.
Click to expand...
That's not entirely true. ..... If the tractor was purchased from the previous owner and that owner had wrote down the serial number, one would be good to go. 8)
 
Thanks guys I will check the engine number. This tractor was purchased new by my great grandfather so with a a little paper digging I may be able to verify the correct year. It was burned up along with a mounted picker in 1978 and the tractor was rebuilt to working order.
 
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