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In the makers mark I think also it is the letter 'Ж' so that narrows down the possibilities. Didn't find any suitable one for 'НЖ' from the period so I try to continue the search. Possibly also he could be unknown from the period.
Yes А·Я that is assayer Aleksandr Ilitj Jachinkov (or Jashinov, Jashenkov??) 1795-1826 in St.Petersburg. The maker, however, is a tricky case. As mentioned his last name starts with Ж (Latin Zh). What letter his forename begins with is ??? Anyway, I didn't either find any suitable master active in StP in early late 1700, early 1800, but the assayer's working period limits also to what period the object was made. Sorry!