The coins were analyzed by x-ray fluorescence (XRF). The following types were examined: Charles I farthings, mid-17th century tokens, coin weights, English regal copper and tin, contemporary forgeries of the latter, Japanese bronze coins. In all 119 analyses are quoted. There is discussion of the sources of copper and the technological developments in brass production, in particular the high zinc brass known as Prince Rupert's metal. Some mid-17th century tokens with high zinc contents were found with a very local distribution in Somerset but with no obvious links with the Dutch origins of high zinc brass using metallic zinc. -- AATA