I add an information that may be useful: I found this periscope in an old attic in a northern Italian city, along with this I found a M42 german helmet.
Thank you very much! What age do you think it is? WW1 or WW2?
So it may have arrived here in northern Italy brought by the Germans during the war. On the other hand they used everything they could, even foreign material..
Then just fold the poor ones apart
and when you fold it back hold the thing on the photo with the arrow - so it is straight down.
Then you see if there is something written on the other side!
Chevyjonny is right. But also try if you can release the lever.
The lever is fastening the position of the 2 main parts.
If it is stuck, then add some penetrating oil or some drops of petroleum/kerosene to the center axis.
. Let it rest for half and hour, then try again. If it is dried out grease, then it needs time to soften it up.
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