"This is only the second time a Tintin plate has exceeded a million euros," Eric Leroy, comic book expert at French auction house Artcurial, told AFP yesterday.
A double page plate also from "King Ottokar's Sceptre" sold for more than 1.5 million euros at Sotheby's in Paris in October.
Artcurial had estimated yesterday's lot would fetch between 600,000 and 800,000 euros, before fees.
"Over a million euros, this is an excellent result," said Leroy.
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The work in blue watercolor, gouache and ink was bought on the phone "by a European collector, a long-time fan", said Leroy.
Published in 1939, "King Ottokar's Sceptre" is the eighth instalment of the adventures of the intrepid boy reporter by the Belgian artist Herge.
Intended by Herge as criticism of Nazi Germany, Tintin helps thwart a plot to overthrow the king of a fictional Central European country which is threatened by an aggressive neighbour.
Tintin works are becoming increasingly popular with collectors.
An ink drawing for the cover pages of the Tintin books published from 1937 to 1958 was sold for 2.65 million euros by Artcurial in 2014, a world record.