Hi - I just posted an image of an extremely tarnished hallmark - i’ve attached it again to this post. The initials on the left may be W.G.S Ltd I think, but not sure if it’s a “w” or not.
It’s a lid to a 1920s-30s powder box. I’ve assumed it’s silver but when I tried to clean, gently with some white spirit even though the black comes away there doesn’t seem to be any silver coming through so I’m wondering if it’s plated and all the sliver has been polished away.
Any help would be very appreciated1