This issue is a variant of The Amazing Spider-Man (Marvel, 1999 series) #648. There exist further variants.
in Spider-Man (Panini France, 2000 series) #142 (novembre 2011)
in Im Netz von Spider-Man (Panini Deutschland, 2006 series) #33 (November 2011)
in Spider-Man: You're Hired! (Marvel, 2011 series) #1 (May 2011)No letters but presentation of upcoming issues with 6 panels of art.