Look closely at pin trading etiquette number 2. it says in a roundabout way that Sedesma pins are not tradeable. The pins must be a metal pins. Sedesma pins are not metal and are obviously not like the disney pins. The Disney pins are made of heavy metal and the more intricate ones weigh quite a bit.
Pin trading etiquette
We had a cast member in EPCOT question whether one of my daughter's pins was not a "Disney" pin and he would not trade with her until he looked it up and saw that it was a Disney Pin. I do not like the Sedesma pins and inform the cast members whenever we get one. My daughter will not take a Sedesma. She says and I agree that they are not real Disney pins.