This dome hat was hand signed by 4 members of Devo in Portland, OR. Mark Mothersbaugh, Bob Mothersbaugh, Gerald (Jerry) Casale, and Josh Hager. More information available upon request. This item has been certified authentic by JSA (Jams Spence Authentication). It comes with a letter of authenticity. You can verify the JSA serial number on their site. Spenceloa.com. That number is, YY27953. Payment must be received within three days of purchase unless otherwise specified. Thank you!