Part of the tank or other vehicle? German or Russian

By Dickdan007 ( November 20, 2017 at 11:44 am) · Filed under History forum

Hello,
I dug today in a Berlin forest in a ditch, on a tree.
At 20 cm depth, this rusty piece came out.
What’s this? Military? Definitely a part of a tank? ;)
The hole has a diameter of 8.5cm. For a sleeve?
Maybe an angle mirror?

All angle mirrors on the Internet are angular. On the angular side are 4 small holes to tighten. Behind the round hole is a second plate. In between came a glass. The color is light gray. Maybe from a Russian Panzerkampfwagen.

I look forward to your answers
Thanks


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