I was looking at my son's lanyard a little while ago that he got a couple years back and there was a pin on there that didn't have the Mickey ears rubber backing like the "real deal" so I was thinking it was a fake or something. But the pin was a Lightening McQueen pin from the Disney Movie Club, so I think that could be why maybe???
Older pins may have a metal backer or may have been replaced with a locking pin back, the backer is not the definitive tell. Tradable pins are cloisonnes (that's enamel ) and have the proper Disney logo.
As per the rules set for (can be found online at various sites)...
•The main criteria to judge whether a pin is tradable or not is that it must be a metal pin bearing a “©Disney”mark on the back that represents a Disney Event, Place or Location, Character or Icon.
•Pins should be in good, undamaged, tradable condition.
•For a safe trading experience, please trade one pin at a time, hand to hand with pin backs attached.
•Guests may trade a maximum of two (2) pins per Cast Member, perday.
•Please refrain from touching a Cast Member’s or Guest’s pins or lanyard. If you need a closer look, kindly ask the Cast Member or Guest wearing the lanyard if she or he can bring it into clearer view for you.
•Monies, gifts or receipts may not be exchanged or used in tradefor a pin.
•When trading with a Cast Member, Guests should offer a pin that is not currently displayed on the Cast Member’s lanyard.
•Pins from other business units of The Walt Disney Company (i.e.ABC, ESPN) are accepted for trade.
•Operating participant pins that show a Disney, Disneyland®Resort, or Walt Disney World®Resort affiliation are accepted for trading.
•Plastic pins, rubber pins or other non-metal pins are not accepted for trading.
•“Personalized Name”pins are not accepted for trade.
•“Broche style”or “clasp pins”are not accepted for trade.
•Disney Service Award pins, Spirit of Disneyland®Resort pins, Partners in Excellence pins or Cast Member costume pins (i.e. Host/Hostess Badges, Disney Trainer) are not tradable.
Remember that all sets MUST be traded together and not broken up.
We have special collectors pins that we got from the manager at the Poly years ago that is a prized possession of my daughters and myself. It is the only one we have ever gotten.