'Common' is a term that is often misunderstood, even by experienced collectors.  The general meaning of a 'Common' label refers to the availability and quantity of a particular title.  "The Round-Up" (pictured above) is a great example of a 'Common' label.  Several thousand of these labels were found in an old cigar factory.  This is a wonderful litho of a Western Themed image and was the first image (along w/Red Cloud) that I purchased over 30 years ago to start my collection.

I have heard collectors make statements like, "I don't want that label, it's common."  Just because a label is considered 'Common' shouldn't alter your opinion of what a great image is.  It certainly doesn't mean the label should not be collected or enjoyed for its beauty.  It just means that if you checked with 5 cigar label dealers...all 5 would have that title available.  Of course all 5 dealers may have a "Fellow Citizen" available as well but only 1 not 1,000 as would be the case with "The Round-Up". Some of my favorite labels are considered 'Common' - beauty by any other name...

Side Note:
An earlier version titled "Round Up" (circa 1915) is harder to come by because the quantity found was much smaller.  The scariest version is referred to as "15¢ Round Up".  In the late ‘20's, early ‘30's, the price of this cigar changed.  The cigar maker probably had a surplus of the early images and just added a 15¢ stamp to the original litho.  Very few images of this version were found and even fewer without a water stain.