2017 MARKET UPDATE:
Frank Castle's first appearance has become super-hot, thanks to the Daredevil TV series on Netflix and other Marvel properties being turned into series. He is strongly rumored to be featuring as a supporting character in one or more of them.
Prices have approached new records for many grades.
Pretty much anything featuring The Punisher is smoking hot property right now. He's expected to cross over into the Marvel TV series Daredevil, Jessica Jones and others.
No book is hotter than his first appearance, of course, though we would also recommend a couple of other books (two out of three didn't quite make the Hot 100 cut this time around):
Amazing Spider-Man #135 (2nd appearance)
Marvel Preview #2 (Punisher origin) on the Hot 100
Giant-Size Spider-Man #4 (Spider-Man vs Punisher, rare in high grade)
There are a lot of copies of ASM #129 around. However, it is seldom offered in CGC 9.8.
Not everybody can afford such an investment, but we suggest that if you can, look for an example with white pages and nice centering, and hang onto it.
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