Okay, my memory is a little fuzzy as where I have purchased these pins. I believe I purchased them all from the KSC Visitor Center in person or through the mail. I pulled out three pins from where I store them in a bag.Two have the same folding tab, blue color outside folded similar as a book of matches leaving a margin of whiteness of the inside showing the mission number.
The other is all white with blue font lettering. The all white tab has WINCO as the manufacturer for STS-88.
The other two have two different manufacturers.
HO HO Art & Craft Int'l Co in New York, New York on STS-83 inside tab.
STS-93 has Perfect Emblems & Dies Corp also from New York City.