Well, it is night vision from the 70's. Look at the AN PVS 2 for size comparison. For it's age, and cost, I think it's a hell of a piece. It's by no means a modern day Gen3 clarity, but compared to other modern day Gen1 pieces I have messed around this thing is far better. Most Gen1 of today need an IR light to be shining to function well, but because this one uses 3 tubes lined in front of each other it's almost like a Gen1+ or Gen 2-. It does suffer from a fish bowl effect around the edges, but after about 5 minutes of playing with the thing it becomes unnoticeable surprisingly.
I have heard that this scope does not work in absolute pitch dark though unless an IR light is used. I'm not sure how dark it has to be to get to that point though, there is no moon out tonight, just stars, and I was getting a great picture with it.
If you can find one for only 100 Euro, that is a steal. Look into how easy AA adaptors are to make for this, put one together, and use it to test out the scope to make sure it still works.
I'll use my Hero3 here in a moment to try and put together a demonstrating video to show how it works. Although, as I'm sure we know, trying get a camera shot inside any scope is never easy and generally looks terrible.