Also found in WORLD SERIES HATS New Era Arizona Diamondbacks Authentic Collection 59FIFTY wool fitted hat by New Era. 'WORLD SERIES CHAMPS' has purple crown and visor, light grey undervisor, raised embroidered team logo on front, 2001 WORLD SERIES embroidered patch on side, raised embroidered MLB logo on back This is the style of hat that was worn onfield during the World Series when they won the championship . These WORLD SERIES CHAMPSs are authentic Arizona Diamondbacks baseball caps made by New Era for official MLB - Major League Baseball teams.