2 Heavily Circulated Marie Therese Thaler coins. How to tell the age of restrike?

Anyone got any way of dating these coins?

Thanks in Advance.

 

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Most of the time the best you can do is find a range (not the exact date-especially for the more modern ones).

Take a look here:
http://www.theresia.name/en/svariants.html

 

I second the website recommended by@ddddd. It is easier to use than Hafner's books.

 

If I am reading the site right, it looks to be modern, just can't tell how modern.

 

What an incredible site. Thanks for sharing, and into the massive bookmark folder it goes.

 

That's the same conclusion I reached. Some of the detail is too worn from what I can see on your pictures but my best guess is the 1853-today range (likely something in the 20th century).