Interesting Silver Brooch/Pendant Crucifix - unknown silver mark

Unusual Brooch / pendant. Any ideas of age, it looks 15th C to me. Also has a silver hallmark that I can't identify.
The gemstones could be ruby and emerald.
Your thoughts appreciated

Any ideas about the hallmark looks like a bear and two 5 pointed stars

Well spotted, could that be a crown at the top of the shield?
I've looked on the russian hallmarks and I've not managed to find anything like it

Arthur (Art) Krupp, Austria used a bear in their silver mark.

Although it's hard to tell from a photograph, the bear and stars look to have been part of the cast piece rather than stamped into the metal, so maybe pseudo-marks rather than hallmarks. It's also odd that the mark is on the front of the piece rather than the rear,.
However, it is possible that it isn't a hallmark or pseudo-mark at all. In Christian mythology the bear is used both as a symbol of the power of the stories and as an allegorical device denoting cruelty and injustice, so it could be that it is intended as part of the design.
I'd agree with Naomi, but lean more towards Indian or possibly Egyptian rather than Mexican, based on the four winged creatures with human heads which owe more to the pre-Christian religions of India and North Africa.