Vintage Tibetan Neckage with Hidden box

I can’t remember if I bought this is Nepal or Tibet but this is a very unique necklace… a piece of art! It’s silver and maybe bronze? Needs a cleaning. You can carry something inside!!! Chain is silver 21.5” Box accross is 3.5” Long Just under 2 inches (box) High From top of the necklace to the bottom (with round things) 3” Inside depth is half an inch…