Vietnam era "gun camera".
It is a gun camera that is mounted on a rifle butt and has a black case and 5x lenses. It has seen a lot of history in making as it was used by soldiers during the Vietnam War. It's not the easiest camera to get your hands on, but right now you can do so on eBay. It's available for $1,318, quite a good price for something right from the pages of history. We don't see anything like this anymore.