Rare Complete Artillery Prism Paralleloscope
I am not sure when these came into use but its certainly post WW2. There is some foxing in the mirror as you can see in the photos but other than that its complete and in reasonable condition.
Please look at all the pictures as this forms the main part of the details of sale/
These are very rare and I have never seen another.
It is very heavy and due to the delicate nature of the mirror / couriers ability to break everything ! would prefer collection or can meet for you to pick up.