What Does IS Mean on Silver?

In the world of silverware and decorative silver, the small stamps and hallmarks on the back of each piece tell a story. They can easily seem like a foreign language to anyone who isn’t a professional jeweler or metalworker. One of the most frequently encountered marks is “IS.” But what does it stand for, why is it important, and how can you use that information when buying, selling, or caring for your silver items? Let’s dive in.
Understanding Silver Hallmarks
Hallmarks serve two primary functions:
- Authentication: They verify the maker or brand of the piece.
- Quality Assurance: They often indicate the purity or composition of the metal.
Silver hallmarks are tiny symbols or letters stamped into the surface of a piece to convey key details such as:
- Manufacturer: Who made it?
- Purity: The percentage of silver versus other metals.
- Origin & Date: Where and when it was produced (in some cases).
For sterling silver, you’ll frequently see markings like “.925” or “Sterling Silver,” denoting that the item is composed of at least 92.5% pure silver, with the remainder typically copper or nickel for strength.
Together, these marks authenticate a piece, help determine its value, and guide proper care.
Decoding “IS” on Your Silver
When you see “IS” on the back of a spoon, fork, or serving dish, it signifies:
- International Silver Co. The “IS” mark is the corporate hallmark for the historic International Silver Company, founded in Meriden, Connecticut, in 1898. Over the 20th century, they became one of the largest and most respected silver manufacturers in the United States. Though the original company ceased manufacturing in the 1980s, the brand name and its hallmark remain one of the most recognized in American silver.
- Quality & Legacy Items stamped “IS” were produced under the company’s exacting standards. Whether sterling silver or silver-plated pieces, that mark speaks to a legacy of craftsmanship spanning more than eight decades.
Sterling vs. Silver-Plated “IS” Pieces
Because International Silver Co. manufactured both sterling and plated lines, you’ll often find “IS” paired with:
- “.925” or “STERLING” Indicates sterling silver, a minimum of 92.5% pure silver alloyed for strength. It’s fine silver.
- “EPNS” (Electroplated Nickel Silver) or “Silver Plate” Denotes a base metal (often nickel or copper) coated with a thin layer of silver.
By checking for these additional marks alongside “IS,” you can immediately tell whether you’re holding a solid sterling piece or a plated item.
Identifying and Appreciating Your “IS” Pieces
- Locate the Mark Look on the back or underside of flatware handles, tray backs, candlestick bases, and the bottoms of hollowware.
- Note Any Accompanying Stamps
- Pattern names (e.g., “Heritage,” “Georgian”)
- Production numbers or letters indicating the year of issue
- Assess Weight & Style Authentic sterling flatware will feel substantial in the hand and display finely detailed patterns. Plated pieces tend to be lighter.
- Research & Compare For an extensive overview of current and vintage International Silver offerings, visit the International Silver Co. Browse patterns, read descriptions, and spot the “IS” hallmark in product listings.
Caring for Your International Silver
Whether you have a family heirloom or a newly acquired flatware set, proper care ensures your “IS” pieces retain their luster:
- Clean Gently: Use mild, phosphate-free detergent and warm water. Rinse and dry immediately to avoid water spots.
- Polish Sparingly: A non-abrasive silver polish will restore shine. Over-polishing can wear down delicate details and plated layers.
- Store Properly: Wrap pieces individually in anti-tarnish cloth or store in a lined chest. Keep them in a low-humidity environment to minimize tarnish.
For more in-depth guidance, see our Sterling Silver Care Guide and FAQs.
Why the “IS” Mark Matters
- Heritage & Value: Pieces stamped “IS” carry the heritage of one of America’s most storied silver companies, making them desirable for collectors.
- Quality Assurance: Whether passed down through generations or newly acquired, “IS” pieces reflect a tradition of superior design and manufacture.
- Resale & Appraisal: Hallmarked items often hold higher resale value and are easier to appraise.
- Ease of Identification: Once you know what “IS” means, you can confidently sort sterling from plated, match patterns, and care for each piece appropriately.
The humble “IS” hallmark is more than just two letters; it’s a stamp of history, craftsmanship, and authenticity. Next time you encounter “IS” on the back of a spoon or serving piece, you’ll know it signifies a legacy of American silvermaking that began in 1898 and continues to shine today.