Well first of all the serial number tag should be on the right side of the transmission. Did you look there? Next look at the block. The casting numbers will be by the starter. Post those. Then on the other side of the block look by the distributor. Is there a small square pad there with a plate  for where a Hobbs hour meter would mount. That change to add the pad was not made till very early in 1952.  Look at the linkage between the brake petal and the actuator arm. On the early tractors the brake petal hooked directly to the  actuator at the brake band cover.  Also on the bottom of the transmission there is normally a casting date when the transmission case was poured. Check all that stuff and get back with us.