http://www.britnumsoc.org/publicati...NJ_70_11.pdf
Here's a place to start. In 1797, the Bank of England started issuing Spanish silver coins as currency, with a tiny countermark. The little marks were counterfeited, and the experiment was failing, so they contracted Boulton in 1804, who offered a counterstamp that covered the whole face of the coin.
Here's a place to start. In 1797, the Bank of England started issuing Spanish silver coins as currency, with a tiny countermark. The little marks were counterfeited, and the experiment was failing, so they contracted Boulton in 1804, who offered a counterstamp that covered the whole face of the coin.





















