Amazing Spider-man #573 Stephen Colbert Retailer Variant CGC 9.8 Signature Series comic book, from Marvel Comics, which has been signed by the creative team of:
Dan Slott - long term series writer
Klaus Janson - interior artist
Joe Quesada - cover artist and Marvel Editor In Chief
Mark Waid - backup story writer
The cover is a spoof of the iconic Silver Age cover on Amazing Fantasy #15, that first introduced the Amazing Spider-man!
It has been professionally graded by CGC, the largest independent comic grading company in the world, and slabbed in a sealed protective case.
The grade is guaranteed to be high investment grade 9.8 (NEAR MINT/MINT) and this is a yellow label CGC Signature Series, which means that an authorised CGC representative witnessed the signings and this also acts as a Certificate Of Authenticity.
As soon as the comic is signed, it is removed by a CGC authorised party and submitted straight to CGC for grading and encapsulation, guaranteeing the authenticity of the signatures.
You can check the validity of this item and the signatures by entering the 10 digit number on the label at the CGC web-site at the CGC comics web-site.
There are no cracks on the case. Any glare is just the scanner on the CGC case, which can cause reflection.