City mark: Moscow, 84 Zolotniki.
Master silversmith mark AP for Alexander Palmen in Tammisaari, where Erik Kollin was apprenticed and later head silversmith at Fabergé.
Mark HA: Nikolaì Lukich Dubrovin (asseur)
Niellage is a silversmithing technique that involves applying niello, a black metallic sulfide that includes copper, silver, and often even lead or borax, filling the intaglio patterns of the engraved metal with this molten alloy; then the nielloed surface is polished to remove the excess metal.
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