We've only had one of these in our rescued collection in all the years. It is a hinged sash for the rear of a 1969 or later Airstream. What makes it unique is that it has no pivot points or tracks on the sides for operators. It also has no striker plates on the bottom for latches. Instead, it has a wide extruded catch piece along the bottom indicating it is likely an emergency escape window. See photos for full details.
