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In the early part of the 20 Century, the Keystone Publishing Company published an annual guide called The Jeweler's Index that contained marks and other reference material. The jewelry mark below is from the 1922 edition. It could be the following jewellers trademark, they use three interlocking circles within a shield.
Return to Three Interlocking circles.
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PLEASE NOTE OTHER SPELLINGS, JEWELLERY, JEWELERY, JEWELEREY, AND JEWELLEREY.