mr.hp how understand this missile is dvina ??? i guess this is sa-2E not f dvina!
You are quite a funny guy.
You ask a question, and when you receive the answer, you do not believe in it...
Here is the easiest way to differentiate between Volhov (SA-2E) and Dvina (SA-2F) missiles...
... just check the Radio Proxy fuse.
(As the Soviet Union never exported SA-2 into Iran, my best guess is that this is a Chinese copy of the Dvina missile exported in 1958.)