"Art Nouveau Plique à Jour Medal Signed J.holy, 18k Gold."
Medal representing the Blessed Virgin signed J.HOLY, blue and red openwork enamel, 18-carat white gold and yellow gold. Dimensions: 23.34 mm x 14.79 mm (without the bail). No engraving on the back, very slight lack of enamel. Weight: 1.99 grams. Eagle's head hallmark. Period: Art Nouveau, around 1900 Delivered in a case and with an invoice. Free and insured shipping. 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato