The Wallace Sterling 365 mark appears on sterling silver pieces produced by Wallace Silversmiths, a major American silver manufacturer known for high-quality flatware and hollowware. The word “Sterling” confirms the piece is made of 92.5% pure silver, while “365” is a pattern or model number used by Wallace to identify a specific design in its catalog. This type of mark is most commonly found on hollowware and serving pieces. The 365 designation helps collectors, appraisers, and enthusiasts authenticate the item, trace its design origin, and determine its value within Wallace’s broad body of work.