Please help identifying hallmark on antique brooch

[Zabava77]

Hello,
This brooch belongs to my grandmother and can be dated with certainty to before 1940. Please, help to identify the hallmark. Maybe this brooch is even older?




Thank you!

[AG2012]

Hi,
Could be French Tete de Mercure (petite garantie) export mark for gold since 1878.
Are there more marks ?
(French maker's marks are always contained within a diamond shaped punch).
Regards

[Zabava77]

This was the only mark. Thank you for your input!

[amena]

I'm sorry but this time I can't agree with Ag 2012. In my opinion this is the non-mandatory mark used in the kingdom of Italy from 1870 to 1935 for the third fineness (800/1000).




Regards
Amena

[AG2012]

Yes,I am glad Amena is right.There is number 3 indicating .8oo (optional mark legislated in Kingdom of Italy 1872).
Regards