I have a filigree silver brooch where there is no room for a hallmark. I have spotted a tiny mark on the brooch pin, but am unable to decipher it. I've no idea where the brooch came from, but it could be somewhere in South America where my late sister spent several months exploring. On the other hand, it could be from anywhere.
The brooch is only 3cm diameter and the pin is less than 1mm thick, so photographing it was quite a challenge!
Here's what I think is the hallmark:
This is the back where you can see the dent from the possible hallmark just below the petals:
And this is the front:
TIA.