I have recently acquired some PNVGs. They might have dubious past (sanctions busting equipment?) because there is no manual, no serial number or asset tag and no markings on the foam rubber lined box they came in. Whilst they are in new condition, they are clearly a Gen1 optic. The rubber caps have pinholes in them for daylight use,and they run on 1 x AA battery. Each eyepice is individually focusable and the pupillary distance is adjustable. Oddly they tip down rather than up if you want to resort to Mk1 eyeball. I thought maybe the mount might have been assembled upside down, but I tried to take it off and reverse it , but I coudn't set them to tip up. The headstrap fittings look slightly British, but the plastic colour makes me think they may be West German, Dutch or perhaps Romanian. They are well made and rugged and came in a glossy OG plastic case, with a now completely perished foam rubber lining. Can anyone tell me more about them? Does anyone have a manual? They have some black muck inside the objective lens, possibly a bit of that perished foam rubber, and I was wondering if they could be cleaned? Also the immage flickers rather annoyingly when used in daylight with the pinhole caps. Is this normal? or is it just a flat battery warning?