the pin set-up surely looks like C.F.Zimmermann (20) but the beading is definetely not Zimmermann.
I saw a similiar mix-up yesterday, i.e a EK1 with beading (rim) from Deumer or Meyer (couldn't determine 100%) and the pin/catch from Zimmermann, or better Zimmermann-style. Unmarked and genuine, like this one.
There is still a lot to be learned and found out about the cross trading of parts for the EK's. Very interesting subject!
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