QUOTE(gxseries @ Dec 5 2007, 08:18 AM)

Andrey5, you might be surpised to know that your example might be an overstruck example over a Spanish 8 pieces of reals (I think that's the right denomination?).
Yes, I know that these bank dollars were overstruck on Spanish colonial 8 Reales. A couple of years ago I sold one with well visible elements of a host coin.
http://avscoins.com/[GB-47]GB-Dollar-1804.jpgProbably I should have kept it, but I needed money badly at that moment and somebody convinced me to sell after I bought a coin in a better grade for my collection, but without the host coin's legend visible.
http://avscoins.com/GB-Bank-Dollar-1804.jpgI doubt that Bank of England needed to certify the coin it minted with an additional countermark. It is probably a private countermark. I would be interested to know if the countermark is from Britain or any of its colonies. If it could be traced to Africa, the coin would be of particular interest to me since I collect coins from that continent.