Need help trying to figure out what the model is??

What you have is a model ZT, what you gave us is the engine serial number. The ZT series used an RE engine. If you look back on the right side of the trasmission case you will find the serial number of the tractor. I'm guessing it is about a 1939 or 1940. That vintage of a Z will have the cast rear wheels with demountable rims. They seem to be a little more popular with collectors as they look neater than the disk rear wheels. Not having lights could or couldn't mean anything. Tons of those tractors came without starter or lights; some had starter only, some lights only, some with both. Some were factory, some had starter and/or lights added later. Engine siezed might mean it's junk, or it could break loose. If the mice got in it the blocks are probably junk. If the rear rims are good and with the cultivator and if the sheet metal is decent the tractor will part out for more than the $300 if you can't fix it. Hope this helps.

Jim