NOS Grafles Shutter curtain

Going through some old camera stuff, I discovered that I have a NOS Graflex shutter curtain. I have no idea where it came from. All I can tell is that it is 8 in. wide. Any idea which camera this could belong to? I'm hoping this is for a 5x7 Press, a camera that I own.

8 inches wide will be for a 5x7 camera, beyond that I don't know. Standard apertures are O, 1 1/2, 3/4, 3/8, 1/8.
The press or Home Portrait was different from standard as the top speed was 1/500 if memory serves.

Correction: The FPS was made as a stand alone accessory for view and plate cameras. I have seen one for a 6 x 8 plate camera. It may be for one of these.