Vintage UNOAERRE 18K Gold Miraculous Medal

Vintage UNOAERRE Italian solid 18K yellow gold oval shape pendant, featuring the Miraculous Medal symbols on both sides.
Front side:
Mary stands on the earth, crushing a serpent beneath her feet. Rays shine forth from Mary's hands.
Words from the vision, originally in French, form an oval frame around the image: "O Mary, conceived without sin, pray for us who have recourse to thee."
Reverse side:
A cross-and-bar surmount a large, bold "M".
Twelve stars mark the perimeter.
Two hearts are depicted underneath the "M", the left encircled with a crown of thorns, the right pierced by a sword. From each, a flame emanates from the top.
Measurements: 39 mm H (with bail) x 21 mm W x 1.5 mm D (bail is not included)
Weight: 7.3 grams
Marked: UNOAERRE 750 and the factory mark