This was my great grandmothers, my grandfather was in ww2 and stormed a castle. Some items we know are from that, but others we have no idea. She recently passed, so we can't ask her anymore. I'm at a loss with this necklace and would greatly appreciate the help. I have absolutely no information on it. And no stamp or brand on it to research it myself, and I just don't know where to start with it.