Hi,
Below is a page from the 1955 Cub owner's manual, showing where the serial number is.
There is an engine serial number also. It is not the same as the tractor serial number, unless it is the 1st year of Cubs, a 1947, then the numbers were only the same for part of the year.
http://farmallcub.com/rudi_cub/www.clea ... age-02.jpg
Sometimes the serial number plate is painted over by someone, or gone, like was said above.
The number is stamped in the plate. If it is painted over, use a good light, and you might be able to read the number under the paint.
The engine serial number has no plate, the number is stamped in the block. You might need to clean the block, and use a good light to see it.
There are Cub owner's manuals at the top of the page at Cub Info, then go to Rudi's Manuals.
