There are few pop culture figures that loom larger over the 20th century than Elvis Presley. From shrieking teenagers to pearl-clutching mothers, the King had an outsized impact on midcentury America and the world at large. In February 1961, his label RCA Records arranged a charity event to celebrate his groundbreaking milestone of selling 75 million records, something no previous artist is thought to have done (though it’s tough to say for certain because of how sales records were kept at the time). At the event, Elvis was presented with a commemorative plaque and a very special Omega watch. While the plaque remains at Graceland in Memphis, Tennessee, the diamond-set, Tiffany dial Omega is hitting the auction block in May at the next Phillips sale in Geneva.