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look at the online encyclopedia of silver marks (wouldn't let me copy the link) under st. Petersburg. the number 875 Vintage Jewelry and Hallmarks | Silver Purity Markings, 925, Sterling, 875, 835 is...

that is neat! looks like it might be hand engraved too. how do you keep the talc from coming out when your using it? does the brush come off for storage in the handle like a travel brush?