25x Image Intensifiers

[Damocles]

For 25x Image Intensifiers, does anyone have any idea what the designers had in mind when they listed these things? I can't find anything in the US inventory that quite works. I've seen all manor of explanations on various TW2K sites, from LLLTV imagers, to Norwegian made add on optics for regular binoculars.

Any idea what these were supposed to represent? Thanks!!