The generic ones like the Philadelphia stars one were around in the early 80's at least, but I never kept track of what teams were available. They were around for Football teams too, and finding lists of teams wasn't as easy as it is now.
The following is just a guess...…….
I wonder if some of them were produced in a minimum quantity that was required and just never sold well enough. Then were a warehouse find, or got remaindered as dead inventory sometime earlier.
I picked up a non-sports batch of stuff (Connecticut town centennial? Bicentenial?) and it included a couple hundred of the same pinback.
Making them cheap enough for souvenir stands I'm thinking the wouldn't even start the presses for under 5000 pieces.
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