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Matte or matt proof coins normally are associated with very well struck up coins with a dark or dull patina. They are normally struck in the Coronation Year of any king or queen. For example the 1902 Edward VII British Halfcrown was struck as a matt proof as well as the normal 'currency' coin. The matt proof example is worth £200 in mint condition (most are). Correct as at 22 March 2012

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