I have a definition from the Mint: "Popular name for a counter or medalet of sovereign size, struck unofficially in 1837, in brass. The figure of St George was replaced by the Duke of Cumberland on horseback with the inscription 'To Hanover' a reference to the unpopular Duke of Cumberland, uncle of Queen Victoria, who succeeded to the Hanoverian throne since Victoria, as a female, was debarred by Salic law from inheritance. "