Here's another rare one; a Calumet roll film holder in 6x7 format for 4x5 backs.

Unique to this holder is that it can take both 120 & 220 films, and also, because all the bulge is on one side of the holder, it can be slipped under the GG with something like a Graphic back with a very tight space between the GG and the back plate.

In extremely good (hardly used?) condition. $150 OBO + shipping & Paypal fees.

If you need it, I will include a quick video tutorial on how to load it; it's a bit tricky at first :-)