Tintin's popularity seems as permanent as the cartoon hero's quiff. Collectors flocked to an auction of vintage Tintin editions in Namur, Belgium, this week. (Text and first seven pics: Laurence Peter, BBC.)
The artist Georges Remi, alias Herge, had a hugely successful career spanning decades. His sketches now command huge sums - but most belong to his Moulinsart estate.
A page of sketches for The Castafiore Emerald, with matching Indian ink story board, fetched 312,500 euros (£280,000).
This vintage Model T Ford, like one driven by Tintin, was on show as part of the Tintin Festival in Namur, just south of Brussels.
The Model T featured in Tintin in the Congo. Some bookshops have moved the book to the adult section because it is said to perpetuate colonialist attitudes.
Tintin and his faithful talking terrier Snowy - or Milou in French - are to feature in a film being made now by Steven Spielberg.
Herge, who died in 1983, was strongly influenced by the clear lines of Chinese art, thanks to his friend Zhang Chongren. But he did not travel much outside of Belgium - unlike Tintin.
An ultra-modern Herge Museum will open to the public on 2 June in Louvain-la-Neuve, a university town near Brussels.
Tintin's famous Moon rocket was displayed in the heart of Brussels recently. A model of the rocket, which Herge used as an aid to drawing, will also be in the new museum.