If it’s an upper case “L” along with a reduce case “c”, it’s for Louis C Marks who designed jewellery from the 40s. SETA is a firm that provides style jewelry. Their jewellery generally includes a CZ plating more than silver. CN implies that the jewelry is manufactured in China, https://alexisuitdl.jts-blog.com/35854434/not-known-factual-statements-about-jp88