Amazing Spider-man #620 Deadpool Retailer Variant CGC 9.6 Signature Series comic book, from Marvel Comics, which has been signed by series writer Dan Slott.

A similar CGC 9.8 Signature Series copy of this book sold for over £400 in April 2018.

It has been professionally graded by CGC, the largest independent comic grading company in the world, and slabbed in a sealed tamper proof protective case.

The comic grade is guaranteed to be investment grade 9.6 (NEAR MINT+) and this is a yellow label CGC signature series, which means that an authorised CGC representative witnessed the signing and this also acts as a Certificate Of Authenticity. CGC remove the comic as soon as it is signed and ship it to their facility in Florida, to ensure that the signature is authentic. 

You can check the validity of this item and the signature by entering the 10 digit code on the yellow label at the CGC web-site.

There are no cracks on the case.