Second vote for a Tokarev. I have one in 9mm by Zastava. Tiny sights, very thin, slide rounded on top, and the hammer is round rather than spurred.
Which is a description of the Hi-Power as well when they have a Commander style hammer on them.
Of course we can't know for sure without a profile but I bet the BHP. Iran had a long relationship with FN that went back to shortly after WWII. After the 1953 overthrow of Muhammad Mosaddegh, in a coup backed by the CIA, the Iranian government of the Shah had a working relationship with FN and ordered a good deal of handguns, rifles, ammo etc from them. The Shah had no close relationship with the Russians. Similarly the government since the overthrow has had no relationship with the Russian government.
Have the Russians been producing the Tokarev? For export sale?
Likely if they wanted handguns and the Tok the only recent source for those would be the Chinese I think. Though I'm not sure.
The Iranians have the M9, Sigs and the Hi-Power in large numbers.
So why would a Iranian military person, or national Guard, etc. be carrying an antiquated design like the Tok when we know they have access to more modern guns and have large numbers of BHPs?
Course could be an individual who likes the Tok. Always a possibility.
tipoc