Here are pictures of them by Season:
Including the 200th episode pin. Designed by Phil Sgriccia . "stamus contra malam" translates to "we stand against evil".
Season 9 pin second from the right, seasons 6-8 on the left, 200th episode pin on the far right. Posted by Adam Glass on his twitter account. (Tweet here.)
Including the 100th episode pin on the left, a 'kick it in the ass' pin between seasons 1 and 2, and a pin on the right which looks like a Season 6 pin.