Antique art deco collar Bib Necklace solid Thick solid sterl Or 10k Gold

ITEMS COMPARED WITH ARE NOT COMPARABLE This elegant Art Deco bib necklace features a stunning teardrop pendant hanging from a U shaped bib collar bow designed necklace all in marcasite just added 3 photos where I missed either hallmark stamp or both before listing. it looks like it says 18 but I am keeping at unmarked authentic antique price...please read on please see almost matching 10k white gold marked ring 428 au = 10k gold ● Metals look the same This is 3xs marked in m last 3 photos UPDATE- see last 3 photos. Appears to have a hidden 18 but it is very difficult to read anything else. Much more resembles 10k to me Anyhow, This elegant rarity features a stunning teardrop pendant hanging from a U shaped bib collar bow designed necklace all in marcasite EXCELLENT CONDITION Purchase authentic antique jewelry not this mass produced glass- gem- and crystal- work going around these apps. It is shameful Please excuse the state of my nails. a VERY FIRM$! with warmth and humility