In view of the mint master's mark, нг for Nikolaj Gratchew, mint master at the Saint Petersburg mint, rather 1832-1841. Gratchew was replaced in 1842, but the 1842 coins no longer bear his initials.
I think the monogram is "IH", so latin, rather than cyrillic. Unsurprising, as love token often occur on coins foreign to the maker.
Peter