WWI Trench Glasses

[EKman]

Hi Gents,
I am posting this for a friend of mine. He would like to know something about these WWI trench glasses. I am not sure what would be the best forum for this item. Any help would be appreciated.
Thanks
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[EKman]

Another View

Here is the back side. Anyone know what something like this is worth?
Thanks for looking.
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[EKman]

Back to the top

I am moving this back to the top in the hopes that someone can provide some info on it.