Eisenstadt Manufacturing Co. originally formed about 1896 and continued production until around 1950 in St. Louis MO.  The company moved several times in St. Louis as they expanded their manufacturing lines expanded past tradtional jewelry into pocketknives, cigarette cases, compacts, and even manicure sets.  The consistantly produced rings, necklaces, bracelets, and earrings as well under lines like "add-a-ring',  Priscilla, and weight marked; they even produced watches and watches cases.