In 2005, Handelshaus Gärtner and Auktionshaus Gärtner moved into their joint location, our current C.G. Collectors World headquarters in Bietigheim-Bissingen on a total of 2,700 m2. One year later, in the summer of 2006, Christoph Gärtner conducted his first international auction. His company was successful right from the start. In the area of philately, it grew into a top-rated player in the league of the most successful auction and mail-order houses.