I recently bought a 6mm iced cuban link necklace for $170, on the back of the clasp it reads “925 BSI CN.” I know 925 is sterling silver and I tested it
925 Sterling Silver Gold Plated Vintage Italy BSI C Z Box Chain Necklace 24"
925 Sterling Silver C Z Cuban Chain Necklace 16" | eBay
925 Sterling Silver Gold Plated Vintage Italy BSI C Z Box Chain Necklace 24 - Etsy
925 Sterling Silver Vintage Italy BSI Saint Barbara Pray for Us Medal Pendant - Etsy