Hi Rick,
I'm afraid to say that this is in no case a characteristic mid-2nd half Silesian/Polish Tschinke ...
The mechanism is of Tschinke mid-17th c. type alright, but the rest of the gun is way too heavily built and too short at the same time. If you wish me to I'll post images of characteristic 1630's-40's Tschinkes. I'm almost sure sure your barrel is shorter, heavier and of unusually large (rifled?) caliber. The average Tschinke calber is of 9-13 mm rifled bore - they were ladies' birding guns after all.
Best, Michael