Modern Proof Maria Theresa Thaler?

@Harrier48, welcome to join the discussions.

Can you show some pictures of your coins?

Great inquiry! I am not familiar with a coin that is missing "ET" on the edge. If it is a very new and shiny example, it would certainly be interesting to see a picture. On older coins edge wear is certainly a possibility as well as other ones.
On the inverted edge wording, such is a fairly well known but scarce variety. I have found them mostly in Vienna Mint packs of the MTT. These would be the vertical packs and I believe they date from about 2002-2004. Interestingly they come as either H60 or H61a in the Hafner numbering (with 2 dots on shield and without the dots). The one without the dots seems to be the scarcer of the two. Finding them with and without the dots is also significant as it may mean that H60 and H61a are not successive coins chronologically but may well be just two different die variations of relatively contemporaneous minting. I have no hard evidence of this. Many folks do not know about this error, so it is possible to find them in groups of MTT. Good Eye!

@MTTFan, thank you your kind words. All the Bests to you.

I am waiting for more specimens and questions so as to recall my focus and interest in this theme.

Hopefully two superior photos of the reverse side of each coin.

For Information: I have sacrificed these two modern MTTs as described above and tested for 833 silver and have found that they are NOT silver. They are silver plated on top of what I guess to be stainless steel. So tread carefully if buying the newer versions. They are very good copies (could they be cheap commemorative copies produced by the Vienna Mint?) and appear correct iro diameter and sometimes weight. There appears to be two common denominators to tell that they are not silver, these being: the letters ET are missing on the edge inscription and the coin thickness is 2.8/2.9mm when it should be 2.5mm.