Several countries can use the same name for their own separate currencies (for example, a "dollar" in Australia, Canada, and the United States). By contrast, several countries can also use the same currency (for example, the euro or the CFA franc), or one country can declare the currency of another country to be legal tender. For example, Panama and El Salvador have declared US currency to be legal tender, and from 1791 to 1857, Spanish silver coins were legal tender in the United States. At various times countries have either re-stamped foreign coins or used currency boards, issuing one note of currency for each note of a foreign government held, as Ecuador currently does.