Here's the reverse as requested. Notice that the hinge has pleen placed off center. I would assume from the parts and the wear it was an earlier example.
top left - great detail, maker unknown to me, more typical 57 hinge/pin/catch.
top right - Deumer L/11 marked example - flatback. From an Oakleaves Generals estate (along with his 57 RK, an EK2, and a 57 RK/EK1/EK2 minicombo).
bottom left - unmarked Deumer factory vaulted screwback. I don't recall seeing another like it and I've heard/read some very experienced EK collectors say this type was never made - obviously not true!
bottom right - unmarked Deumer factory vaulted pinback.
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