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I'm having awful trouble finding a part I need for my KV2. So I looked at the KV1 turret and it has one of these, but I don't want to start tearing into it.
Another guy has done a similar conversion, from captured KV2 to Soviet KV2, and he says he got this specific part from a dead link. Since it was 3 years ago not much point making a throwaway account and asking.
So what are these things actually called? Are they some sort of periscope?