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So the cyrillic "inverted v" or "lambda" should be the town mark of Leningrad (Saint Petersburg).
But I didn't find anything on the ring and diamond symbol.
Any clue regarding the hallmarks or the manufacturing year is kindly appreciated.
Regards
Yes the town is Leningrad and the time span is 1958-1992. Unfortunately I have not managed to find the name of the factory. Let's hope somebody else knows it.