This book was signed by Ryan Stegman !!
A little about CGC. This is a SIGNATURE SERIES verified by CGC. (Certified Guaranty Company)
To qualify for a Signature Series (Yellow Label), the signature has to be obtained by the artist with a CGC employee to witness the transaction. This label is applied to comic book that have been signed by someone of significance to the comic, under the direct observation of a CGC representative, and are thus certified as an authentic signature by CGC.