13" antique gold fill ornate curb chain with a snappy bolt and dog clip. Perfect for a small wrist doubled as a bracelet, or an extender. 14.4g, links are a bit less than 5mm wide. ACo is the Automatic Chain Company, a jewery manufacturer established in 1912 in Providence, RI. 1/20 12K indicates 12k gold filled- 1/20th, or 5%, of the weight is gold. Fun Facts!