That's a nice original Wiedmann with a more uncommon set up. You might want to post some close ups of that hinge to make sure it hasn't been resoldered. The area shows some discoloration and some solder marks, but this could as well be all ok!
I agree with the others. An original IAB made by E.Ferd Wiedmann. Ths setup variant is not that common, but some years ago some examples with this type of hinge and catch were found. Here's my example. In my opinion it's the same varaint.
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