CALVERTON, N.Y. — Walter Yacoboski scraped together nearly every penny he made as short-order cook in 1979 to begin buying a small collection of rare comic books for $10,000, hoping his boyhood passion could one day pay off as an investment.

That day may soon be here.

Yacoboski’s copy of “Amazing Fantasy” No. 15 from 1962 – which introduced the world to Spider- Man – could fetch $400,000 or more when it goes up for auction later this month.

“This is the first time I really sold anything,” said the 60-year-old Yacoboski, who wants to use the proceeds to buy his late father’s 17-acre vegetable farm in Calverton on eastern Long Island.

He insisted that the fact that he was recently laid off as a supermarket baker after more than 27 years is not the reason he’s selling now.

“I have had it for 36 years and it’s just time,” said Yacoboski, who is also is selling a 1963 Spider-Man, as well as two “Fantastic Four” editions and a “Justice League of America,” which combined could bring an additional $75,000.

But the crown jewel is the “Amazing Fantasy” issue, which Yacoboski originally purchased individually for $1,200 in 1980. Its cover, featuring a price of 12 cents, shows Spider-Man clutching a villain in one arm and swinging from his web with the other.

Stan Lee and Steve Ditko co-created the web-slinger and his alter ego, the educationally gifted but awkward Peter Parker, whose life changed forever when he was bitten by a radioactive spider. It paved the way for Spider-Man adventures on television and the big screen.

Lon Allen, managing director of the comics department at Dallas-based Heritage Auctions – which is conducting the sale Thursday – said there are probably 4,000 to 5,000 copies of “Amazing Fantasy” No. 15 in circulation. But Yacoboski’s copy is in nearly mint condition.

“It was graded 9.4 on a scale of 1 to 10, that’s what makes it super desirable and really special,” Allen said. “Whoever buys this comic will be joining an elite club.”