Good condition, no certification- found in a bookstore a while back and clearing house for downsize. Looked pretty genuine but who knows for sure? This is the only book I have ever listed so it is not something I counterfeit for profit. I am not expressing in any way this is authentic, just noticed the signature after I bought the book. Hope that clears things up. FREE SHIPPING TO LOWER 48 STATES. INTERNATIONAL SALES CONTACT ME FIRST - GLOBAL SHIPPING PROG...RAM WILL BE AVAILABLE ONLY.