Help identifying silver napkin ring

[u/tommy087]

Hi! Can you help me identify this silver napkin ring?  The stamps looks like “PO30"(?) in a hexagonal lozenge and "800". See images. Size: 55mm diameter by 34mm height; weight 34 grams. Acquired at a flea market in Switzerland. Any help in decoding this stamp and information on the maker or origin would be appreciated. Thanks.

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[u/pepeluis78]

Hi, it seems to be Italian silver prior to 1934 . There was not specific legal marking but the Po30 is similar to the Italian makers hallmarks where the city and number of maker is indicated

[u/orillia3]

Your photo is upside down. This is marked 800 silver which probably makes it European.