British band Led Zeppelin is one of the greatest and most influential rock and roll groups of all time. This gorgeous and incredibly rare silver pin was measures 1 1/8" and was in limited supply, presented only to band members and VIPs. Who knows? Perhaps this "pledge pin" adorned the lapel of Robert Plant's jacket. Sources estimate Led Zeppelin has sold somewhere between 200 and 300 million records since their first album in 1969, ranking them number two all-time in the United States behind compatriots the Beatles.