There's also a very simple answer to this question.
In the 80s and I believe even back to the 70s, the earliest plastic sheets that were designed to fit T-cards were ever so slightly small. Many collectors who embraced the idea of putting their cards in plastic sheets decided to cut their cards down, ever-so-slightly, to make for a better fit into these sheets.
I've heard this explanation from several different old-school collectors.
-Al
|