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New Era Seattle Mariners Authentic and Original 59FIFTY Cooperstown fitted hat by New Era. 'COOP' has navy blue wool blend crown and team color teal visor. 'COOP' has light grey undervisor, embroidered team logo on front, raised embroidered Cooperstown MLB logo on back. These COOPs are authentic Seattle Mariners baseball caps made by New Era for official MLB - Major League Baseball teams.