1 gen 1754 anni - 1754: Silver content of Spanish dollar is decreased to 0.9028 fine, but is probably only around 0.89 fine.

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Source:

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

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