Vintage- MX signed Maltese Etruscan Cross with Topaz & Mixed Metals

Vintage- Maltese Cross Silver and Gold Tone Clip Back Earrings marked MX on the back, which according to the jewelry manufacturer/ hallmark book that I have, could be the Moore & Son Company, est. in 1866 producing rings & other jewelry through 1965. - 7/8” x 7/8”x 1/4” thick - 3-dimensional pattern made of silver-tone damascene with gold leaf accents all surrounding a beautiful emerald cut small 5mm x 5 mm yellow topaz square-shaped gemstone nestled in the center -Open paddle back clips, which was a popular style around the 1960s