The Tiffany & Co. 22843 M mark appears on sterling silver items crafted by Tiffany & Co., one of America's most celebrated silversmiths. The number 22843 is a pattern or order number used by Tiffany to catalog specific designs, while the letter M typically refers to the production period under John C. Moore II, whose directorship helped define Tiffany’s high standards from around 1907 to 1947. This mark ensures authenticity, links the piece to a precise period in Tiffany’s manufacturing history, and helps collectors trace and date the item accurately.