The best info I have managed to glean from internet is that the 667 is the same as the Linhof/Cabin
http://www.a1.nl/phomepag/markerink/proj_667.htm (Go to web page and do a search [edit/find] for 667 - eventually you will come to relevant info after 3rd hit).
However as I don't quite know what model(s) they are reffering to so I am none the wiser.
The Linhof/Cabin is certainly a different model to the Pro Cabin 67-Z marketed in US by Mamiya.
So perhaps someone can give info about Linhof/Cabin