your coin does not have a B mint mark at reverse bottom. instead there are several points. there are a number of other such small points around the perimeter on the reverse.
on the obverse, the rim entirely lacks dentilation and has a legend instead of laurel leaves.
it looks like copper to me in the pictures. please measure diameter and weight.
edit to add - it looks more like the gold 25 tuman
https://en.numista.com/catalogue/pieces80966.html
I suggest it is a copy of that. it may have been gold plated at one time.
Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac