Sasropakis wrote:It could be Cyrillic ГР so in Latin alphabet GR. One mark with those initials is listed here for Kiev 1880-1908 but unfortunately is the maker is unknown: https://www.925-1000.com/Frussia_makers_A_r.html The hallmark looks somewhat different and doesn't seem to have dot between the letters so it might be a different maker but at least it might be worth searching other makers with initials GR instead of IP.
Agree with Sasropakis it is clearly Cyrillic ГР so PL #606 (unknown maker in Kiev).
Just forget about Julius Rappoport and Fabrage, nothing to do with them. Even the quality is nothing close to their work.
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