Calumet 67 roll film back for 120/220 film [4x5]
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 :-)