An auction in Dallas earlier this week for memorabilia from the hit HBO series “Game of Thrones” generated over $21 million in sales.

Heritage Auctions, the event organizer, says that more than 2,000 pieces were sold and that more than 4,500 bidders participated globally.

Earlier this year, The Dallas Express reported that Dallas-based Heritage Auctions would list Action Comics #1, famous for debuting Superman. The issue would go on to sell for a record-breaking $6 million.

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At $21.1 million, the “Game of Thrones” event marks Heritage Auctions’ second most successful on record, just behind the Debbie Reynolds auction in 2011, which netted $22.8 million.

“From the moment we launched the ‘Game of Thrones’ auction in September, it was clear this was going to resonate with everyone… These are extraordinary treasures made by Emmy-winning costume designers and prop makers, who worked tirelessly to adapt George R.R. Martin’s wonderful novels. People wanted a piece of that Game of Thrones magic, and we are honored to have been part of what designer Michele Clapton calls these costumes and props’ afterlives. Everyone at Heritage thanks HBO for the opportunity to ride along,” said Heritage Auctions Executive Vice President Joe Maddalena in an Oct. 13 press release.

The auction’s highest price was $1,490,000 for a touring version of the Iron Throne, a molded replica of the original used in the show. The second highest purchase was Longclaw, a sword wielded by Jon Snow, fetching $4,000. Snow’s Night Watch ensemble, complete with a heavy cape, pulled in $337,500, while his fur ensemble, seen in season seven, generated $137,500.

“We are so pleased with the result of this auction for some of the most iconic ‘Game of Thrones’ memorabilia,” HBO Executive Vice President of Production Janet Graham Borba said in the release. “These fans continue to be passionate collectors, and we are grateful to them and our partners at Heritage for making this a giant success.