The obverse is Mary Stuart the wife of William of Orange who claimed the English throne through Mary.
The latin inscription reads "The husband is head of the wife, as Christ is head of the Church" which is pretty much summing up William's somewhat flimsy claim to the crown.
The Jacobites (Stuart partisans) didn't buy it and promptly invaded, twice. Unfortunately we lost, twice.
Non illegitimis carborundum est. Excellent advice for all coins.
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Цитата: lapislazuliThanks, now it is more clear to me.
But I still have questions. Has the coin more than gold value? What is the gold carat in this coin?
My guess is it contains no gold at all, but that's easily checked with a density test like this: https://en.numista.com/numisdoc/measure-a-coin-s-density-27.html
Silver is 10.5g/cm^3, lead is 11.34, pure gold 19.32. A density above that of lead pretty much means it contains some gold or other heavy PM, unless it's made of a tungsten alloy... uhm maybe I just confused you with this?