Officialy the rules say:
Any Cloisonee, Semi cloisonee, hard enamel, or metal Disney pin, or a operating participant pin, that represents a specific Disney event, place, location, character(s), or icon(s). Is a valid for pin trading.
Basicaly if it looks like a disney pin and says disney anywhere on it you are good. If is says or looks non Disney like "Welcome to Wisconsin the home of cheese" then no they aren't going to accept it.
There are many variations of back stamps depending on where it was originaly sold, so don't worry about which ones you got. For example Disney Co., Disney World, Disney Land, Disney Tokyo, Disney auctions, Offical Disney Pin trading,
Disney store, etc...
Have fun, and Happy pin trading.
