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Gold world coin alloy and thickness database

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Hi guys,


I've been looking for that for a while, and I can't find a good source of that information.


I'm looking for a database of thickness (not only diameter) of world coins (especially french), and their gold alloy.


I know that up to some date, french gold coins were alloy with silver, then some later dates (around 1830) look like some kind of copper/silver mix.


Also catalogs such as the krause only list AGW, not alloy, and neglect to list thickness as well.

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