Thomas Evans registered his first mark on 11th March 1774 as a spoon-maker. He may well have had other, earlier marks that were in the missing register. His latest mark was entered on 11th November 1792. All of the Thomas Evans tongs that I have seen are marked in the bowls with one exception. The exception is the pair with the incuse duty mark of 1784 to 1786.
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c1780 - 1782
1784 - 1786
1786 - 1790