When it comes to determining the value of a comic book, age is one of the first things to consider. Comics from the 70s or earlier are more likely to be valuable, and almost all of them have the retail cover price printed on the cover. 10c, 12c, 15c, 20c or 25c are all indicators of a comic's potential worth. Certain comics have become increasingly sought after due to their rarity.
For example, the insert that follows Amazing Spider-Man 252 is highly valued by collectors as it marks the character's first appearance in a comic book. It also features the continuation of the Secret Wars story and the origin of the black Spider-Man costume, which would later become Venom. The 1990s saw a surge in comic book purchases, which ultimately led to a decrease in demand and a crash in the market. Many of these books are now essentially worthless, but there are some exceptions.
The platinum-foil variant of Spawn 1, for example, features the first appearance (without preview) of The Maxx and has some value. Similarly, Disney's popular cartoon from the 90s made its characters appear in comics for the first time in this issue, and collectors are starting to take notice. Phantom Lady is another rare and well-compiled comic that is worth looking out for. With only 11 issues published, many of them “daring”, it is an interesting find for any collector. Squirrel Girl has also become a much-loved Marvel character and her first appearance in a comic book is worth noting. If you think you may have found any of these valuable comics, Sell My Comic Books can evaluate them for free.
It's important to remember that while some key comics from the 90s may be worth money, most are not - so it's best to get an expert opinion before investing too much.
