Were WW1 period scopes waterproof?

[Kiwi]

Were any British ww1 period scopes waterproof or would they have been prone to moisture intrusion and consequential fogging up when climatic conditions changed? ? I have three Aldis Brothers 1916 scopes, a Westley and Richards scope, and recently acquired a a PPCo Model 1918 scope and none of them appear are what I would call sealed units.

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