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ACO" on a sterling silver necklace likely refers to the Automatic Chain Company, a jewelry manufacturer founded in 1912 in Providence, Rhode Island. The company is known to work with various metals, including silver and gold.
While "925" or the word "sterling" typically indicates genuine sterling silver content of 92.5%, the "ACO" is the manufacturer's mark, which identifies the company that made the item. The presence of an "ACO" stamp on pieces described as sterling silver in product listings suggests it is a recognized manufacturer's mark associated with that
Vintage ACO Signed Sterling Silver 16” Chain
* ACO - Hallmark
* 925 Sterling Silver - Hallmark
* Weight: 2.12 Grams
* Measurements - 16”
* Excellent condition
