The International Silver Co. 2500C/16 mark appears on silver items produced by the International Silver Company, a major American manufacturer known for its wide range of silverplate and sterling silver products. The mark includes the company name and the catalog number “2500C/16,” which identifies a specific design, shape, or size in their production line—often found on hollowware or serving pieces. While many items with this type of mark are silverplated, a separate “Sterling” stamp would confirm if the item is solid silver. The 2500C/16 designation helps collectors and appraisers match, catalog, and evaluate pieces accurately.