Summary of gold-silver ratios and the value of the guinea in nine countries
One pound weight of fine gold is recconed in France equall in value to 15 pound weight of fine silver, & at this rate a Guiena is worth 1li 0s. 0d.
According to the proportion of Gold to silver in Holland a Guinea is worth about 1li. 0s. 0d. or 20s. 7d
In the Dukedomes f Brandenburgh, Saxony, Brunswick & Lunenburg, Hannover, Zeel, Wolfenbuttel &c the Guinea is 1li. 0s. 4d. or 20s. 5d
At Hamburgh it is worth 20s. 0d or 20s. 1d. At Dantzig it is worth 19. 11 or 20s.
At Rome Venice Florence Leghorn Bulloin Ancona Millain Naples Genoa the Spanish Pistole & French Lewidor is worth about 15s 10d & the Guinea is worth about 20s. 6d 7d or 8d
In Spain pme pound weight fine ☉ is equal in value to 16 pound weight of ine ☽. For a double doblon or four Pistole piece is of equal weight with a silver Doller or piece of eight & passes for 16 such pieces of eight; at which rate a Guinea is worth 22s. 1d. The high price of Gold in Spain makes their Silver goe into Europe as fast as it comes from the West Indies.
In France one pound weight of fine gold is recconed equal in value to 15 pound weight of fine silver & at this rate a Guinea is worth 20s. 8d
According to the proportion of Gold to silver in Italy & Holland a Guinea is worth about 20s. 7d.
In the Dukedomes of Brandenburg, Saxony, Brunswich, Lunenburg, Hannover, Zell, Wolfenbuttel, &c the Guinea is worth about 20s 5d
At Hamburgh it is worth about 20s 1d.
At Dantzick it is worth about 20s.
In Portugal it is of about the same value as in Spain.
Source
MINT 19/2/5, National Archives, Kew, Richmond, Surrey, UK1700-1701, c. 357 words.