Very Rare Vintage Miraculous Sterling Silver n Marcasite Necklace

Very Rare Vintage Miraculous Sterling Silver n Marcasite Necklace The Chain Clasp is Vintage and will open by pulling back the little Lip Part(see photo) This is a Very Rare Piece, old but in Excellent Condition I believe this was made in Italy Not sure what the Marks stand for (see pics) Tested Sterling Silver both chain and Pendant Pendant Meas - 1 1/2” Long x 3/4” Wide Chain meas- 19” Long Weighs- 9.36 grams In Excellent Condition