A standard, classic optical sight for the RPG-7 developed in the 1960s. There are quite a few of them, and they are practically attached to every RPG.
This sight was manufactured in 1973 and was trophyed by our fighters in 2023, 50 years after its creation. It came with an interesting rare bag in orc pixel style with various spare parts for the sight.
You can read about the PG-7V here: