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.

wisner_r.jpg

wista45dxiii.jpg

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.


Steve