Yvert et Tellier is a postage stamp dealer and a philatelic publishing company founded in 1895 in the northern French city of Amiens, where the head office is still located. The logo is a circle divided into a snowflake and a smiling sun. It is a pun on the name of the company: hiver, été liés ("winter, summer together") sounds a lot like the French pronunciation of Yvert et Tellier. The family company was founded by Eugène Yvert in 1831 as a printing works for a legitimist newspaper. The switch to philately was decided 1895 by Eugène's grandson Louis Yvert and his chief printer Théodule Tellier. Nowadays the company is still run by the Yvert family. Products Yvert et Tellier's major product is a stamp catalog which is a reference for stamps and countries that are most collected by French philatelists: France, Andorra, Monaco, and the former French colonies and their philatelic history as independent states. In France, it is one of the most important philatelic publishing companies, along with Cérès and Dallay. Continuing the old association between Louis Yvert and Théodore Champion, the Ancienne Maison Théodore Champion edits monthly and yearly a colour catalog of newly issued stamps from all over the world. Usually, Yvert catalogs for non-European countries were printed in black and white, but in 2008 they started with full color prints. It is one of the international references as well, with Michel, Scott and Stanley Gibbons. The Yvert catalogs list stamps issued by all countries in the world, but for non-European countries, the volumes are organized in alphabetic order whereas the German company Michel uses a geographical classification. History Genesis and management successions During the 1890s in Amiens, the Yvert family's printing works is the property of Louis Yvert, grandson of the founder, and his chief printer Théodule Tellier; Tellier kept the company running after the premature death of Louis' father. Louis did not like being in charge of the legimist paper founded by his father, L'Écho de la Somme. He discovered stamp collecting thanks to Tellier, a philatelist, who had already added a small philatelic newspaper, L'Écho de la timbrologie, to the papers printed by the company. In 1895, Yvert and Tellier started getting involved in philatelic books. In November 1896 they published a worldwide catalog of stamps and a stamp album. The success was immediate because of their logical and permanent numbering, in contrast