At last, the 1928 show. Ihagee Zweiverschluss Duplex 9x12
Got one of these a few days ago and did a quick and dirty repair on the shutter in advance of getting some proper curtain material and replacing it properly. Overall it's in very good condition and the FP shutter is a hoot, allowing me to use all sorts of old lenses.
Magically, the Rada back and several film holders fitted it like a glove. I was sort of hoping for that.
The device itself, followed by the first pic taken on it in decades. Film is 120 rollfilm in a Rada back. Fuji Neopan 400. Lens is 18cm Eurynar @6.8 with a bit of internal blotching from (presumably) element separation.