The International Silver Company 2500C/16 mark is found on silver items produced by the International Silver Company, a leading American manufacturer of both sterling and silverplate products throughout the 20th century. This specific mark includes the company name and the catalog number “2500C/16,” which identifies the exact pattern, form, and sometimes size or variation of the piece. The number provides a precise reference for dating and identifying the item within International Silver’s catalog. While most items in this range are silverplated, confirmation of silver content should be based on the presence or absence of a “Sterling” mark. This detailed mark helps collectors, sellers, and appraisers track design lines and determine value.