Maria Theresa Thaler (Austrian, not Australian), it a re strike of a coin that had a frozen date. Was mainly used as a bullion coin before bullion coins where a thing, seem to be in old stackers silver piles a lot. There mintage is something I don't know much about. However there are some rarer varieties.
The U is AUST is a V, so straight away you know its a restrike.
Original coins minted from 1780 to 1792 had the V as a U. These were minted right up to the 1970s and used as bullion dollars in the Middle East, most of Africa and in Asia.
Along with Mexican and Peruvian silver pesos and sols, these were the most reliable money of their day. Abyssinia even counted their currency in Thalers before the 1940s because of these coins.
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