Niello bangle bracelet

Silver and Black Niello City and a Boat Bracelet measuring 7 3/4", measuring from the inside X 5/8", and marked THAILAND STERLING.. SIAM was the official name until 1939, but from 1939 through 1945 the official name was THAILAND, and then changed back to SIAM from 1945+.So this could be from the early 40’s or later. weighs approx. 27 grams. Clasp works. Safety chain has come unhooked but with proper tools can be reattached. Gorgeous bracelet. I have not cleaned as I don’t want to ruin it.