19 sept 1857 año - 09/19/1857: The Maria Theresa Thaler is declared an official trade coin by Austria. In trading partners of Austria without an official state currency, such as Arabia and certain African nations, the Maria Theresa Thaler are the established currency in the economy.

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Sources:

Stride, H. G. "THE MARIA THERESA THALER." The Numismatic Chronicle and Journal of the Royal Numismatic Society 16 (1956): 339-43. www.jstor.org/stable/42678400.

Tschoegl, Adrian E. “Maria Theresa’s Thaler: A Case of International Money.” Eastern Economic Journal, vol. 27, no. 4, Fall 2001, p. 443. EBSCOhost, search.ebscohost.com/login.aspx?direct=true&db=bth&AN=5600521&site=eds-live.