Any information on this?

I have a silver cross pendant, but have no idea the history, what the markings are, or anything.
It appears to be handmade, but that’s all I can deduce and haven’t found anything about it on the internet :confused: I think the marks say “PCI&CO”, but have no idea what the checkered looking marks are.
silver cross 2.jpeg
silver cross 3.jpeg
silver cross 4.jpeg