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Hi
Most Marconi cameras of the early valve era had 5" round viewfinders, the later MkIV camera had a 7" viewfinder, but this was built into the camera body and not removable.
If it is defiantly a Marconi viewfinder it may be from one of the early colour cameras of the "coffin" design with 3 x 3" I.O. tubes. It could be you have a rare item there, some pictures would be good for identification purposes.
There were 3 generations of Marconi I.O. colour cameras. All had larger viewfinders to match the large size of the camera.
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