2 Jun 1497 Jahr - 06/02/1497: After Spain was united by the marriage of Ferdinand of Aragon and Isabella of Castille, they reformed the monetary system to combine their two regions together. After the discovery of silver in the Spanish colonies in the Americas, the Spanish Pieces of Eight are established as a competitor to the Joachimsthaler. The prolific output of the Spanish mines allow the Spanish Dollar to replace the Joachimsthaler as the main trading currency. It is worth 0.931 fine or 25.563 g fine silver.

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Sources:

Sumner, W. G. "The Spanish Dollar and the Colonial Shilling." The American Historical Review 3, no. 4 (1898): 607-19. doi:10.2307/1834139.

Murphy, Sharon Ann. Review of Spanish Dollars and Sister Republics: The Money That Made Mexico and the United States, by Tatiana Seijas and Jake Frederick. Journal of the Early Republic 39, no. 2 (2019): 370-371. doi:10.1353/jer.2019.0046.