They're Called Rare Backs...

[MVSNYC]

I agree Leon!

And, that’s a bad-ass Uzit!

[Cory]

Would you call polar bear, old mill and sovereign rare backs? Technically I guess they really are, but not compared to uzit, drum, etc. Of course if I was selling any uzits or drums they would be labelled as ultra rare or something to that effect. I use the term off back to denote anything not peidmont or sweet cap.

[Eggoman]

ONLY 4 on PSA's Pop Report...

[RCMcKenzie]

"Off Back" sounds like "Off Brand", which suggests a lesser known product that is often discounted, like knock-off shoes. For medium scarce backs like Polar Bear, I would say, "tougher" or "more difficult" back.

Making progress on AB350NF. Here's Murphy from Sterling. I think this puts me at 23/37. I have not added to my checklist since Jan 22, so I may have missed a few.

[DeanH3]

I don't have any extremely difficult backs so these will have to do.

[stutor]

Maybe ‘off back’ is better suited for cards such as these...

[MVSNYC]

Great cards, guys! Keep 'em coming...Sonny, Jeff, wow!

I agree with a lot of the comments/terminology above...common, less common, tough/difficult, tougher/more difficult, extremely difficult, rare, very rare, extremely rare, ultra rare, uber rare.

[t206fanatic]

a few AB460 backs