Most rare pin?

[Matt7187]

What pin has the least ever made and is the most rare? I have one that is a limited edition of 300, but I was wondering what the most rare one was.

 

[NiarrNDisney]

I do not have the answer but you may find some info on PinPics
I do know however that some CM's have rare pins that they give out for certain reasons like touring facilities or associates of companies they are working with. I know this because I have received said pins before.