You seem to have answered the question yourself! You only have to look at the construction to see it isn't military - having a brass carry handle, stained plywood and varnished as well. I said it isn't of military origin - meaning purpose made for the military. That is entirely different than saying it wasn't used by the military, but I would think the chances of that are extremely remote. The military-issue wooden periscopes were quite different in design too.
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