Guy on Ebay was guessing it is a G&B. But it is the same upper and lower jar housing. His is 66 1/2” skins so possibly mine has been modified, but it has not been cut and the angles of the supports seem in line.

I am going to fabricate my own skins as I have a sheet metal shop and I can use all G&B cylinder and hardware, it is just kinda driving me nuts that it is not a known example. I have probably done 8 hrs research.