Missing ID Plate

If I remember right on the left hand front of the engine is the tractor serial number just below the head
 
Casting codes will get you close
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I agree with old. You should be able to find the serial number on the engine block someplace. These didn't always match the serial number plate from factory, but most of the time it was the same serial number. I think the only time they didn't, is when they got thier parts out of wack on the assembly line. Whatever the case, I don't think it happened very much. Way more often than not, they always seemed to match and be the same number.

There is probably places to buy reproduction plates, but you'll likely have to stamp the number in the plate yourself. I wouldn't mess with that, unless for cosmetics on a restore. Even then, I'd probably just leave the plate un-stamped. Just use the number that's on the block. Unless you fill the block has been changed out (not the same factory engine when new).
 
Their is a flat spot in the casting below number 1 spark plug. That's the spark plug closest to the radiator. The engine serial number should be stamped there though you might have to use a wire brush to clean it up to be readable. Also the throttle rod runs right in front of that spot which makes it hard to see. The serial number should start with FAA. Casting codes will be a number for the month, then a number for the day of the month then a letter for the year. These numbers are separated by what looks like a screw head. The year 1939 was the letter I. You can count up from there. For example J would be 1940. You should be able to find a casting code at least on the engine and the transmission. Would not be unusual to find at least some of the parts of a tractor have been replaced over the past 80 years. Ask again if you have more questions.
Dave
 
As already stated, the engine number is stamped into the block just below the #1 spark plug. These matched the tractor serial numbers up to 201000. After that, the factory didn't try to keep them in sync.

If the engine has been swapped out, the engine number wouldn't be helpful. You can usually tell if the engine or other major components have been changed by comparing casting codes (also as previously stated).
 

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