Silver Age keys represent many of the most valuable comic books in the collecting market. In fact, several outpace older Golden Age books because the period was a superhero renaissance with the introduction of many new heroes that are among the most popular today. Their status translates into impressive sales from the debuts of those heroes and villains.

Each year in The Overstreet Comic Book Price Guide, Robert M. Overstreet creates a list of the most valuable books based on their comic age. The Silver Age list from 2015’s Guide #45 includes the expected titles – first Spider-Man, Barry Allen/Flash, Avengers, Justice League – but many of their values in Near Mint condition reflect how much prices have gone up in the ten years since then.

#1 – Amazing Fantasy #15 – $240,000
#2 – Incredible Hulk #1 – $150,000
#3 – Fantastic Four #1 – $120,000
#4 – Showcase #4 – $80,000
#5 – Amazing Spider-Man #1 – $60,000
#5 – Journey Into Mystery #83 – $60,000
#5 – Brave and the Bold #28 – $60,000
#8 – X-Men #1 – $44,000
#9 – Tales of Suspense #39 – $42,000
#10 – Tales to Astonish #27 – $40,000
#11 – Showcase #22 – $34,000
#12 – Avengers #1 – $33,000
#13 – Flash #105 – $23,000
#14 – Justice League of America #1 – $22,000
#15 – Showcase #8 – $19,500
#16 – Adventure Comics #247 – $19,000
#17 – Fantastic Four #5 – $18,500
#18 – Our Army at War #83 – $18,000
#19 – Green Lantern #1 – $16,000
#20 – Strange Tales #110 – $15,000