Well, I have some news about this. In my newly acquired Le reve data booklet, I can see that from about 1875, Gasc & Charconnet, made a version of their Quick Acting Petzval, called B in their catalogues, which is described as " imite ceux de Dallmeyer". Now I happen to have a quick acting G&C Petzval sold by Bryant in the USA and I noted that the rear cell had the 2 lenses mounted separately - without giving a thought to what this might mean. It does, indeed, have the Dallmeyer rear layout. Adjustment can only be made by taking off the rear cell and screwing the inner cell.
These were made in 3 sizes:
13cm efl, lens diameter 54mm
16cm efl, lens diameter 70mm
25cm efl, lens diameter 81mm
It is last one I have.
It might be a good idea to check your Bryant/G & C lens!
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