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Since it says on the instructions to leave the cover on during the day,and also not to look at any bright light sources,I'd hazard a guess you have a night vision scope or monocular.
Change the batteries and give her try.
I would hazard a guess that its an AN/PVS-2 Gen 1. You're probably looking at a $1000 CDN. Not a scope expert by any means, but thats what it looks like. Markings sync up pretty well anyway...