stamp issued by Belgian Post for the 50th anniversary of the publication of Tintin's first adventure on 29 September 1979, featuring Tintin and Snowy looking through a magnifying glass at several stamps. In 1999, a nine-stamp block celebrating ten years of the Belgian Comic Strip Center was issued, with the center stamp a photo of Tintin's famous moon rocket that dominates the Comic Strip Center's entry hall. To mark the end of the Belgian Franc and to celebrate the seventieth anniversary of the publication of Tintin in the Congo, two more stamps were issued by Belgian Post on 31 December 2001: Tintin in a pith helmet and a souvenir sheet with a single stamp in the center. The stamps were jointly issued in the Democratic Republic of the Congo. In 2004, Belgian Post celebrated its own seventy-fifth anniversary, as well as the fiftieth anniversary of the publication of Explorers on the Moon, and the thirty-fifth anniversary of the moon landings with a souvenir sheet of five stamps based upon the Explorers on the Moon adventure. To celebrate the centenary of Hergé's birth in 2007, Belgian Post issued a sheet of 25 stamps depicting the album covers of all 24 Adventures of Tintin (in 24 languages) plus Hergé's portrait in the center. A souvenir sheet of ten stamps called "Tintin on screen", issued 30 August 2011, depicts the Tintin film and television adaptations. Tintin has also been commemorated by coin several times. In 1995, the (Paris Mint) issued a set of twelve gold medallions, available in a limited edition of 5000. A silver medallion was minted in 2004 to commemorate the 50th anniversary of the Tintin book Explorers on the Moon, again in a limited run, this time of 10,000. It quickly sold out. In 2004, Belgium minted a limited edition commemorative euro coin featuring Tintin and Snowy celebrating the 75th anniversary of Tintin's first adventure in January 2004. Although it has a face value of €10, it is, as with other commemorative euro coins, legal tender only in the country in which it was issued—in this case, Belgium. In 2006–2012 France issued the Comic Strip Heroes commemorative coin series featuring famous Franco-Belgian comics, beginning in 2006 with Tintin. It was a set of six different euro coins honouring Hergé: three 1½-euro silver coins featuring Tintin and the Professor, Tintin and Captain Haddock, and Tintin and Chang; a €10 (gold) featuring