The book is personally inscribed and signed, not just flat-signed. Joseph Heller was a notably infrequent signer, and inscribed copies like this are significantly scarcer than standard signatures. The signature style and inscription are consistent with known authentic examples from Heller’s lifetime. A Certificate of Authenticity (COA) from a private collection is included. While this is not third-party authentication, it accompanies the book as provenance. No PSA/JSA/Beckett authentication is included. Overall good vintage condition for a paperback of this age. Please review all photos carefully – they are part of the description.