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The making of wrought silver was recorded in Exeter in the Middle Ages. the Roman capital letter "X", sometimes crowned, was used as a town mark in the 16th and 17th centuries. From 1701 the Town Mark of a three towered turreted castle was used with the re-establishment of the Assay Office which closed in 1883. The date letter sequence started in November 1701, then changed annually in August from 1702.