The Sterling 55 mark appears on items made of genuine sterling silver, with “Sterling” confirming the standard 92.5% silver content. The number “55” typically represents a pattern, model, or catalog number used by the manufacturer to identify a specific design or form. In cases where no maker’s mark is present, such numeric codes help collectors and appraisers trace the piece’s production origin and match it to other items. While the exact maker may remain unknown, the Sterling 55 mark still provides a reliable reference for verifying material and cataloging the piece.