Tom:

As you may have noticed I added ten tractor numbers to your list, the one that really puzzles me is number 2520 this is an engine only I don't have the tractor for it but the tractor should be serial number 102292 engine number is 101821 and extra number on engine is 2520.

This does not go in line with the others Could it be a goof up?? Should it have been 2025 or 2052?? Here is a picture of the number as you can see the first # 2 has been hit several times.