Posted By:
RobertSThe only square cards I have ever seen have not had any black paper on the back -- nor any signs of scrapbook removal (paper loss, glue, etc.).
Also, if they were another Colgan's issue why would they not have any other product reference on the reverse?
Perhaps they were similar to the many mini-releases from Topps which were done as test issues in certain areas (Topps would run tests in Brooklyn and Philadelphia)?
Here's an example of two of the same player. As you can see, the photos are exactly the same (only the Colgan's Chips card is off-center):
