Frank Miller's original cover for Batman: The Dark Knight Returns #2 sold at auction last week for $478,000, The Associated Press reports. Initial expectations had placed the price at more than $500,000.

Although Heritage Auctions has sold other original art from the landmark 1986 DC Comics miniseries — a page from Issue 3, featuring Batman and Robin in mid-air, fetched a record $448,125 in 2011 — this was the first cover to ever appear at auction. It’s also the only one from the four-issue series to be rendered completely in pen and ink by Miller.

A near-mint copy of 1940′s Batman #1, featuring the first appearance of Catwoman and The Joker, went for $567,625 at the same auction. A similar copy sold for $850,000 in 2012.

The record price paid at auction for a comic is held by a near-mint copy of Action Comics #1, which fetched $2.16 million in 2011.