Mico Springback Adapter with Hood and Ground Glass for Folding Cameras

I am no photo expert but from what I can discover about this item it was used for the folding box style cameras with the billows. It slides on the back of the camera and allows you to use 9x12 cm film (I think). It seems to be in nice vintage condition. Not sure but I think these were from the 40s or 50s. In any case it would be a great gadget for someone that collects old photo equipment. I would love to hear if you know more about this piece.