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When emptying the attic of their deceased mother in San Francisco, three siblings found in a cardboard box a Superman comic from 1939, the first solely of the hero. At a Heritage auction, the copy became the most expensive comic book in the world, purchased by a collector for $9.12 million.
A sad task of organizing the house of someone who passed away ended in a million-dollar find. Three siblings, who preferred to remain anonymous, were emptying the attic of their deceased mother’s house in San Francisco, United States, when they found inside a cardboard box, among old newspapers, a stack of comic books. Among them was a copy of Superman No. 1, from 1939. The story was reported by Fortune.
What seemed like old paper was a treasure. At a Heritage Auctions event in November 2025, the Superman comic was sold for $9.12 million, about 50 million reais, becoming the most expensive comic book ever sold. The detail that touches the family is that the brothers’ mother had bought the magazine as a child, for just 10 cents.
The find at the back of the attic
The discovery came at the least expected moment. The three siblings were tidying up the attic of their mother’s house in San Francisco after her death when they opened a cardboard box full of old newspapers.
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Underneath the yellowed paper was a stack of comic books stored for decades, and none of them imagined what they had in their hands.
The stack hid rarities. Besides the coveted Superman No. 1, the siblings found other old titles, including five initial issues of Action Comics, the publisher that originated the hero.
It was a small time capsule from the early days of superheroes, forgotten in the attic for generations.
Given the possible value, they acted cautiously. Instead of selling impulsively, the siblings contacted the Heritage Auctions house a few months after the find and remained anonymous.
It was up to the experts to confirm that the dusty comic from the attic was, in fact, a gem of world collecting.
What comic is this: Superman No. 1, from 1939
It’s worth clarifying the piece, because there is common confusion. Superman No. 1, released in 1939, was the first magazine dedicated entirely to the Man of Steel.
It is not the same as Action Comics No. 1, from 1938, which featured the character’s debut. Both are legendary, but they represent different milestones in comic book history.
Superman No. 1 has its own significance. It was with this that the hero gained a solo publication, a sign that the success in Action Comics was so great that it justified an exclusive magazine.
That’s why the comic is so desired: it marks the moment when Superman stopped sharing pages and became a newsstand star on his own.
This context helps to understand the price. A copy of Superman No. 1 is not just old paper, it’s a piece of the birth of superhero culture.
When such a comic appears in good condition, the interest of collectors worldwide explodes, and that is exactly what happened with the piece found in the attic.
The mother who bought it for 10 cents at 9 years old
Behind the fortune, there is a childhood story. According to Fortune, the mother of the three brothers bought that Superman No. 1 when she was just 9 years old, in San Francisco during the Great Depression.
To gather the money for the magazine, which cost 10 cents, she would have combined her savings with those of a teenage brother.
The magazine never left the family. Bought by a girl in the 1930s, the comic book crossed more than eight decades stored away, until it ended up in a cardboard box in the attic.
This nearly lifelong bond is part of what makes the story so special, far beyond its market value.
There was even a bit of help from the climatic chance. Experts cited by the press recall that the cold and humid climate of San Francisco may have contributed to preserving the paper for so long.
Stored away from heat and light, the Superman comic book reached today in a condition that surprised even the appraisers.
The rare condition that multiplied the value
In the world of comics, preservation is everything. The copy was evaluated by CGC, a company that grades the condition of comics on a scale up to 10, and received a score of 9.0.
For a magazine over 85 years old, it’s an extremely high score, as even newly printed comics rarely reach the top of the scale.
This grade is what separates a treasure from a curiosity. Two copies of the same Superman comic book can be worth vastly different fortunes depending on their condition, and it was the rarity of finding a No. 1 so well-preserved that sparked collectors’ interest.
The higher the grade, the greater the competition.
That’s why the technical evaluation was decisive. Before going to auction, the comic underwent analysis that confirmed its authenticity and condition, providing assurance to those willing to pay millions.
Without this seal, no collector would agree to shell out a record sum for a magazine found in an attic box.
The record auction of $9.12 million
The gavel struck at a historic value. On November 20, 2025, Heritage Auctions sold Superman No. 1 for $9.12 million, making it the most expensive comic book ever auctioned in the world.
The buyer, another collector who preferred anonymity, took home one of the rarest items in comics.
The previous record also belonged to Superman. Until then, the mark was held by a copy of Action Comics No. 1, from 1938, featuring the hero’s debut, sold in 2024 for $6 million, also by Heritage.
In just over a year, the ceiling of the comic book market jumped from 6 to over 9 million dollars.
For the three siblings, the auction changed everything. An inheritance that was forgotten in the attic turned into an amount capable of changing the life of an entire family.
What began as the heavy task of emptying their mother’s house ended as one of the greatest finds in the history of collecting.
Why collectors pay millions for a comic book
The price may seem absurd, but it has market logic. For collectors, a Superman No. 1 comic is an item of art and history at the same time, with tiny supply and huge demand.
When rarity, impeccable condition, and the aura of an icon come together, the value skyrockets at auction.
Superman helps explain the craze. As one of the most well-known characters on the planet, he turns his first solo magazine into a cultural symbol, not just printed paper.
For many wealthy people, buying this comic is like taking home a piece of the beginning of the entire superhero industry.
In Brazil, the passion for comics is also strong, albeit on a different scale. Generations grew up reading comics at newsstands, and the collecting of old magazines has a loyal audience here.
The story of the attic find reminds us that sometimes, the most valuable item in a house is hidden in a box that no one has looked at for years.
And you, do you still keep old comics at home?
The story of the three brothers proves that a simple comic book can be worth a fortune: Superman No. 1, from 1939, found in the attic of a deceased mother in San Francisco, became the most expensive comic book in the world when it was auctioned for $9.12 million at a Heritage auction, purchased by an anonymous collector.
And you, do you have any old comics stored in a forgotten box, inherited from parents or grandparents? Share in the comments which comic book marked your childhood and if you would have the courage to auction such a rarity or keep it in the family forever.
