This ex-voto is a pewter, sacred heart, with a threaded lid just below the flame. It's a reproduction of an antique convent holy water vessel. It's engraved with the Monogram of Mary - a large script "M" surrounded by flowers. You can remove the flame-lid to see that the heart has a slender opening, large enough for a tiny keepsake - such as a lock of hair (or pet fur), grains of sand from a treasured visit, a rolled up note, or even ashes of a loved one - the beauty and love that is represented by the Sacred Heart allows for the most precious keepsake.
Although this is a reproduction of a holy water vessel, filling the vial with liquids is not recommended as it's manufactured for decorative purposes and not water steadfastness.
With the artisan craftsmanship involved, no two of these ex-votos are exactly alike; we added the 3rd and 4th picture to illustrate some of the subtle differences in engraving, brightness/color, and shape that may occur.
A hook on the back allows it to be made in to a necklace or charm, a wall hanging, or even an ornament. It is hollow and lightweight, making it easy to hang in delicate places, such as the wrist of your Santos, or even a wedding bouquet.
The sacred heart measures 4 inches from the top of the flame to the bottom of the heart.