The only corresponding hallmarks to the ones on this necklace clasp are Danish or Finnish with letter date indicating late 1800s. The center hallmark is indiscernible, even with my macro lens. Any suggestions will be very much appreciated ; - )
Considering the apparent age of the piece and the fact that the gold background to the filigree is untarnished leads me to believe this part could be gold. Loathe to drop acid directly onto that surface to test and cannot make contact with my testing stone.