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This is a Captain's Spoon from the Narva trading house G. E. Gendt & Co. issued in 1864 and assayed in St. Petersburg by Aleksandr Nikolayevich Mitin (PL 1174, 1175).
I have not been able to find the maker ИЛ: PL shows only two marks of the right period (1293, 1294) and only one mark is a square mark and has only one pellet (1294). I have no other sources.
I thank you in advance for your help!

A remainder bump...

Thank you!

In the meantime I found online the two Ivanov volumes but unfortunately they are not much help to me. Ivanov shows about 9 makers with initials ИЛ of the right period but does not show any actual marks... And Bäcksbacka shows only one "unknown maker" (no. 817, p. 481), who I think is the same as PL's no.1293. In other words, I still don't know who my И•Л. is.

I am very grateful for any help or suggestions.

Small correction: the maker's mark on my spoon should be И•Л• and not И•Л. as I wrote before. Apologies.