This 50'' gun metal muff chain dates to the turn of the Victorian era. Judging by the wonderful old construction of the original swivel hook I would say at least back to 1880.
Our estate watch chain is adorned with random amethyst crystals that do not line up. I would imagine that the chain has been shortened but I am not about to alter it to adjust the crystals. Amazing enough that it has survived as well as it has. These chains are hard to find and real treasures. Age appropriate wear.