This is unusually large studio camera made for up to 30x40cm, and, perhaps, even very close to 40x50cm. The "Drop down" system of loading the back plate is unusual for this sort of camera, as well as the edge fixing fitments. Thre is usual a "place in" system with a central top latch.
THis system does seem to make the conversion of just about any available sliding back on the market "Metric or inches" an extremely easy thing to do!
All you need to do is to find an attractive piece of wood which fits flush in the square back with a brass or aluminium profile which fits in the bottom grove. Depending on the size and style of the back you wish to use, you may have to move the locking tabs a lttle higher.
My personal opinion is that you will never be able to find extra plateholders of this exact design or a back into which it will fit properly.
Perhaps you should think about the size of the format you are most interested in for portrait/still life and the process you might be using?
The back shown is a quite simple one, but with a drop down system from a slightly earlier camera than yours. It has the back plate and square plate holders. The GG screen frame hinges down and the holder is inserted from the side. The two guiding wooden pieces are quite simple and are just screwed onto the back plate. So your new back could be a sliding back with just 2 pieces of profiled mahogany.
camera backs were frequently changed over decades and, especialy, spring backs are often found on these old studio cameras.
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