1924, Paris: Athletes bridge language barriers by exchanging team pins as a gesture of international goodwill.
1960, Squaw Valley (Calif.): Sylvania Electric issues first Olympic sponsor pin at Winter Games; limited quantity makes it popular with collectors.
1980, Lake Placid (New York): Olympin, first Olympic pin club, is formed following Winter Games.
1984, Los Angeles: Interest in pin trading reaches new heights with media and team pins the most sought-after; first pin guide published.
1988, Calgary (Canada): Coca-Cola sponsors its first Olympic Pin Trading Center; Jamaican bobsled team pin becomes prized possession.
* Common pins: Most traders exchange these one for another; some are willing to pay extra ($5-$8) for a pin they really want and have been unable to find.