Qrt.S wrote:About the town mark of St Petersburg.
However there is one very very rare mark used between about 1826 and 1876. It is: С.П:БУРГЪ. After 1908 another mark drops in С.П.БУРГЪ. Please note the change. The colon is changed into a dot (.).

Qrt.S wrote:Evening,
Anyway, the soot mark looks exactly the same as Postnikova #1154 except for the second dot mark which is superseded with a colon. In other words the mark you show Dad but with a colon. However, I would be interested in knowing what makes you think it is a trade mark/manufacturer's mark. If it would be that, why is not the manufacturer mentioned but the town only? As I mentioned it is a very rare mark indeed and it was used as from 1826 to 1860 not to 1876 as I stated earlier, sorry.
Dad! Kindly do not call the mark you show for a troiniki /triple ! It is not a troiniki. A troiniki is totally different mark used in late 1800. It is a poincon i.e. a punch put together of three marks, the assayer, the purity and the town mark to one punch, a poincon.
Qrt.S





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