If it’s an upper situation “L” along with a reduce case “c”, it’s for Louis C Marks who designed jewellery from the 40s. Having said that, this interpretation is less likely, as “JP” alone doesn’t usually signify a certain metallic normal. Halo can be a stone setting over the ring, https://felixvjugo.blogstival.com/58524715/facts-about-jp88-revealed