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| A matched pair of gold and silver-plated Colt Thuer Deringers in Hartley and Graham case; image courtesy of Greg Martin Auctions.; |
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| Detail of engraving on the Colt Thuer Deringers; image courtesy of Greg Martin Auctions.; |
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| Colt barrel marking on the Thuer Presentation Deringers; image courtesy of Greg Martin Auctions.; |
