These are all over the internet (including here on eBay but it seems no one selling it can say what that hallmark means. I'm still not sure whether it's a cross or a four petaled flower or what.
That's exactly what it is after looking the Zia Sun Symbol up! It's very interesting. It's a sacred symbol from a branch of the Pueblo Community! So it's not really a makers hallmark. It's just a silver smith's way of blessing there piece of jewelry and to give it some origin! Thank's for all the help!
