Reginald S
Member
I think they are called "double rail" holders, Anybody?
With a look to an old Rada filmholder and rollfilm cassette prospect I linked in the other thread you should find the precise Typus:

KW Patent-Etui 9 x 12 Plate Holder
I recently got a 1931-35 KW Patent-Etui 9x12 glass plate camera. It has the focusing screen but had no plate holder. I purchased one recently but when it arrived I noticed that is has no pressure plate to keep the glass flush against the focal plane. I also noticed that the opening for exposure...

Filmholders have been named from their construction, especially the connection of the parts with a "Falz" (fold?).
Unfortunately I forgot the typus of my similar 9x12cm filmholders - could be the Millon Falz.
Linhof and Plaubel have exclusively (to my opinion) sold this cassettes, and they are compatible.
What I clearly can see from negatives loaded to my 9x12cm filmholders is that they make the film more flat than plastic holders like Fidelity.
I really love them but 10 holders in the pocket is a weight
