Some comments.
I have a small Tupperware of old film in the fridg. They have been there for decades. One was a Verichrome Pan 620 with expiry year on the box of 1976. Serif "Kodak" logo, yellow backing paper, red trailer at the end, For years I had thought that I needed a 620 camera to try it out until I discovered that it fitted quite easily into my old Rolleiflex. So I shot the roll and developed it in Ilford ID-11 to Plus-X times.
Some problems and discoveries.
When loading it into a Patterson spiral, unpeel and discard the paper first. Else it gets tangled up with the film proper.
The very thin 620 spool puts a lot of curl on the film. I cut off the bottom half cm which helped a bit, Even so getting it into the spiral was really dificult.
As with 35mm, it helps to clip or round the leading corners so that it dosn't catch the sides of the spiral.
I had a dim red safelight but was loading in shadow. I doubt if it fogged the fiilm. (35mm I can work in pitch black, but I knew loading 6cm wide film was going to be tough.)
So far so good.
BUT, I was so used to mixing up 290ml of developer that I forgot that I needed 500ml for 6cm wide film. So at the end of the developing process I found that two thirds was fully developed, a one third strip down the side much less so. (Agitation was four inversions during 10 secs each minute.) However after scanning, the "under-developed" parts look about right. The "fully developed" parts are over-developed and lacking contrast. So use less than Plus-X developing times.
(I have just tried to upload an image, but at 1024 kb Phottio is telling me its too big, but not what the max size is. Or perhaps I'm not qualified to upload files.)