Here is a picture of an all original Tomahawk that Don owned.
You can see how the exhaust was routed. Like Don mentioned, you have the high exit exhaust so someone probably was using tracks at one time. As far as the sticker on the dash goes, you'll come to find that Attex sometimes used whatever parts were laying around the factory at the time of assembly. There are folks on here that have found machines with frames that had older serial numbers stamped on them, but they were in newer model bodies just to give you an example. I'd be willing to guess that whoever was putting machines together that day at the factory stuck a two stroke sticker on the dash without paying attention to what model the machine was.....there are many possibilities. Compare the pictures to yours and see if things are the same.....check the driven clutch on the T-20 also. This site is so great because of all the resources and people that are on here, you can find out tons of useful information about your machine. Anyways, that is a great machine you have there, regardless. As far as the engine goes, check for spark, compression, and see if it getting fuel. Keep us updated.