Hi Rick,
That's exaktly what it is: An early 18th c. dubious 'wheellock' rifle mounted with a mid to late-17th c. Tschinke lock. The trigger and trigger guard are of late 18th c. form and do not belong either. I'm afraid it's a crudely composite piece which in no way can be called a 'Tschinke' ...

Honestly, I wouldn' touch it!
In order to make sure what characteristic Silesian (Teschen, Polish) Tschinkes look like I posted a few images.
Please note the typical shapes of the butt stock and the lock mechanism! The one in the bottom image is a rare Italian version with two wheellock mechanisms on the same lockplate, for firing superimposed loads!
Best,
Michael