if this is a ps14 then it will not have the variable gain like a pvs14 and it could be a fat or slim anvis tube - if its gen3 then i would think slim anvis ,as may have been said above - black faint marking while looking at light sources can be normal especially streaking as you move across them .should fade quickly.usually does it when first used and not so much when been on for a few minutes
if there is condensation inside then best to get it dried out as it will do harm , if its put together in a dry atmosphere then purging should not be needed
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Nvg Ps14 Maintain/ Repair Advice