I have a small, thin coin that has similar imagery to the Maria Theresa Thaler. The edges are worn in places, so I can't make out everything that is written.
On the front there is an image of a bust and it says. D. G. FRID AUG REX (something) & ELECTOR
On the back there is a coat of arms (very similar to the Thaler only the shield is round, not box-like) and it says . 1740 IN PROVINCIIS IVR SAXON PROVISOR & VICAR IVS.
I took a couple of photos but I was unable to get a good shot with my camera.