Posted By:
Bobleon- Good question. The cards with Cycle, Broadleaf and Anonymous Factory backs only are definitely not "commons" and are considered scarce. That leaves the cards which were only issued with Recruit and Napoleon backs. (For purposes of this discussion, the Anonymous Factory backs, I am at work and am forgetting the number of the Factory, which are issued hypothetically on any card, common or scarce are omitted). Of that group of Recruits and Napoleon backs only, the Napoleon back is a tough back, but if we are talking only about the fronts, that entire group is generally considered a common with a few exceptions. Graham, Ellis, Kling, George and Scott are 5 which come to mind immediately which are tough, and although "commons," are hard to find, especially in nice shape. There are a few more I have forgotten off-hand (some consider Schulte tougher than normal among commons).
What's particularly odd is that a few HOFers appear all the time (Marquard, etc.) Because HOFs can't technically be considered "commons" the general abundance of these cards must not be considered.
So, I would consider a T207 common one with a Recruit back, not a HOFer, and not one of the 6-7 toughies. Clear as mud? If we get in to the oddball Anonymous Factory back we really open up a can of worms which would take pages to detail 