Do a search for images of Wisner and Wista cameras. Wisners have pins which locate in brass strips at the top and bottom and Wistas have a similar arrangement but with pieces of brass bent to ninety degrees to hold the back in place. The back is stepped so it locates itself into the rear frame.



The back locates onto the bottom set of clips/brackets then two slides at the top draw it into place either by pulling in on the pins or directly onto the rear plate.