The Tiffany, Young & Ellis JCM Sterling mark appears on very early sterling silver pieces produced by the original firm of Tiffany, Young & Ellis, before the company became solely known as Tiffany & Co. around 1853. The initials JCM refer to John C. Moore, the master silversmith who crafted many early Tiffany pieces. Items marked this way are among the earliest Tiffany silver products, highly collectible for their historical significance, craftsmanship, and connection to the company’s founding years.