«... vague information and sources» ....
Is that what you call my information from an official source that a person had a silver workshop? It's your own business. And what sources are given in the books of PL and Ivanov?
1. There is a brand of ФМ, not Ф"М".
2. Address books give a lot of information for determining silversmiths. In the course of research, it is checked as much as possible. More complete information about the residents and their professions appeared only at the beginning of the 20th century. Last week I managed to install 4 previously unknown masters and the address books helped me.
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4. I looked. I do not see in your sources information about a particular silversmith from this topic.
5. I showed you two "ФМ" stamps earlier, so that it would be clear that the shape of the stamp and the time of the master's work are not indicated correctly there. The master from the PL book has nothing to do with the masters I found.
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8. If you can't find information about Fedor Mnev, then I'm sorry. I succeeded. I see no reason why I should show you all the sources by which I was able to identify the masters. Sometimes the study may contain links to 30-40 sources. I don't even have time for this. This is my personal exclusive information, which has not been published anywhere yet. Maybe I'm writing my reference book?))) I am a kind person and by F.Maximov showed you some of the information. I'm not forcing you to accept it. We are all free people. you can ignore my opinion, and read PL. It's only your choice.
F.Mnev was the owner of (ризочеканная) workshop, but I have to make sure that he worked exactly with silver. I don't have enough time and reason right now.
9. You are right. Many archives have been badly damaged, but there is a lot of information there that is just waiting for its time. I have no financial opportunity to work directly in the archives themselves. Digitized information from archives helps, but it is not enough. I have to think more and look for different versions))). It is even useful!
All the best!
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