If it’s an upper case “L” and also a decrease situation “c”, it’s for Louis C Marks who designed jewellery within the 40s. SETA is a corporation that offers fashion jewelry. Their jewellery ordinarily has a CZ plating more than silver. CN implies that the jewelry is manufactured in China, https://hkfuturestrading22221.blogdon.net/detailed-notes-on-jp88-53000410