UK:
c.1856:
Citation: The measures, weights, & moneys of all nations; and an analysis of the ... (1856) Wesley Stoker B. Woolhouse p.38
USA:
June 1856:
Where Silver Alloy .900 Ag was $1.225,
1856: 1 Troy Ounce Silver (.999 Fine) = $1.3611
1 Preuss. Thlr. = $ 0.73 (US Silver)
Germany:
June, 1856:
Russia:
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