I have what I think is a vintage silver butterfly wings and Guilloché brooch which has a little damage to one of its wings.
I'd like to find out who the markers are and which country it came from if possible please.
The photo with the mark is about as best as I can get of the mark. It looks a bit like an M with a line through the middle and underneath. Also has 930S under the mark.
Please find photos attached.
TIA
Susie

