For sale is a Graflex RH-20 6x7 rollfilm back for 220 (EDIT: and 120!) film. This fits "baby Graflok" 2x3 or 6x9 cameras. It looks almost completely unused and comes with original box, packing materials, and literature. There is a tear in one corner of the outer box.
I do not have 220 film to test, but I have tested with a roll of 120 without any light leaks, the seals all look good to me and there's barely a scratch on this thing.
Received as part of a bundle with another film back I wanted, and have no need for this one. but it might be useful to a collector or someone who respools 120 to 220.
I believe you can run 120 through this back with the only issue having to wind 10 times after the 10th photo to clear the auto-stop. The light seals are probably perfect because it is a labyrinth type of seal, no foam. GLWS
I've never had any problems running 120 film through my RB67 Pro 220 back, sometimes the spacing on the last couple frames are slightly closer together. That does look like a really nice 6x7 back, good luck with the sale!
Bump! $40 OBO. I can confirm that it does in fact take 120 film, and simply requires advancing the counter 10 extra frames after finishing a roll in order to reset.