Heinrich Koehler, together with its four sister companies on three continents, constitutes a worldwide network of stamp auctions of long-standing tradition, the “Global Philatelic Network”. All the companies come under the holding company Koehler & Corinphila Holding GmbH, with its headquarters in Wiesbaden.

The group of stamp auction houses known as the Global Philatelic Network is globally active and well-known worldwide in philately with its companies of long-established tradition. The Wiesbaden-based stamp auction house of Heinrich Koehler is the oldest stamp auction house in Germany and was founded as long ago as 1913. Corinphila Auctions of Zurich is the oldest stamp auction house in Switzerland, founded in 1921, and has held stamp auctions since 1925. John Bull Auctions is the oldest stamp auction company in Hong Kong. H.R. Harmers was founded in 1940 in the U.S.A. and has auctioned the collection of the American President Franklin D. Roosevelt among others. The annual auction turnover of all the companies is between 25 and 30 million euros.

Virtually all the companies have for many years been ranked among the leading companies in their respective home countries. As a group in an increasingly globalized market it is one of the three leading auction groups for the marketing of high-value collectors’ stamps and is well prepared for the future.