It was certainly a factory job as every isolette L has it. But it is pretty much as you thought it would be. Except for the fact that it has 1 single red window for film numbers. I'v seen instructions on the net on how to advance properly for the smaller format using the dots between the numbers on the paper back.Originally Posted by Donald Qualls
It has a top plate specifically made for the camera with a lever to flip the viewfinder mask.