Italian Enameled Virgin Mary Miraculous Medal Bow Pin Brooch

This petite vintage Catholic pin or brooch is a silvertone metal bow with embossed crown-of-thorns decoration. A triangular enameled Miraculous Mary medal dangles below. Just an inch wide by about 1-1/4" long, the pin needs a cleaning, The back of the medal is marked Italy and there is tiny, tiny lettering around the upper loop but I cannot make it out, perhaps it says Sterling but that's just a guess.