Planchet planchet is struck. After striking, it becomes a coin and is no longer a planchet. Occasionally, a planchet will escape the mint without having been struck. This is a blank planchet error, and is usually worth a few dollars for modern coins. Occasionally, blank planchets can be rare and valuable, such is the case for Morgan Dollar blank planchets, although authentication is highly recommended for such pieces as they would be fairly easy to counterfeit. Planchet A planchet \ˈplan-chət\ is a round metal disk that is ready to be struck as a coin. An older word for planchet is flan.
Bell metal (representing Absolute and Relative Truth) is also sometimes used. A similar alloy is employed for the gongs, saron, demung, and numerous other struck metallophones of the Indonesian gamelan ensembles. In this case the tin:copper ratio is traditionally given as 3:10 by weight. Whereas bells are cast and then left to cool, the metal of Indonesian gongs and metallophones is cast as rough blanks which are then hot-forged to their final shape with hammers. Bell metal was used to cast many early Spanish, Portuguese and "Malay" cannon, most notably the Malay cannon known erroneously as "Rentaka". In Java, bell metal mixtures