That looks like a Medallion.. not a coin Yours could be a re-strike https://www.ebay.co.uk/itm/1780-Aus...m=372406247870&_trksid=p2047675.c100012.m1985
Almost certainly a restrike. They are not rare, and seem to sell for a bit over melt value. Maybe $17-$23.
https://en.wikipedia.org/wiki/Maria_Theresa_thaler The Maria Theresa thaler has been used as a trade coin for a long time, and has been restruck at various world mints since 1780, all bearing the 1780 date. It's probably worth its weight in silver, but not much more.
Right, the "original" MTT was a coin, and used in several parts of the world. The modern ones however are restrikes made by the Austrian Mint (which still makes and sells them, see here for example). Christian
I have heard that, in addition to the small stream of restrikes still being made today specifically for sale (as I believe the OC probably was, given the customized presentation box) they were still being struck in quantity and used for trade in some areas as late as the 1960's. There are ways (I used to have the URL to a website on M. Theresas a couple years back, prior to a computer disaster) to determine if a piece comes from an old striking or a more recent one, although wear is a significant tell-tale of some age. I have seen the common, more recent strikes sell in the vicinity of US $20 in recent years.
When I lived in Chad (Central Africa) in the 1970s, MTTs were still used in trade. I used to pick up some nice ones from the money changers in the local markets as they would have many I could sort through. They served as my "local coin store" -- mat on the sand and poles supporting a mat above to provide some shelter from the sun. I recommend the book by Hafner as the best source for identifying the originals and also the various later mints; I have successfully used it. Supposedly there may be a new book on the subject coming out but I haven't heard anything in a couple of years. The website given by @alurid above, http://www.theresia.name/en/, is excellent and even presents many of the Hafner numbers. This website will go a long way toward helping one to identify the various "varieties." I was not previously aware of this website, so I thank alurid for pointing it out.
