23 1/2" f/6.3 Zeiss Anastigmat Convertible by Ross London, what is it?

Prompted by Garrett's response, I have done some more searching for Protar VII, and found an old Carl Zeiss catalog from 1927, that states that similar lens was sold in this configuration by Carl Zeiss Jena, covers 8x10, has a combined focal length of 13".
I should try to mount it on Korona, and see if it has enough bellows, as Garrett suggested.
 
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