Michel Postzegelcatalogus Link -

The catalog's influence extends beyond the world of philately, too. Its rigorous approach to research and cataloging has inspired similar projects in other fields, such as numismatics and sigillography.

Michel’s editorial board, based at the Schwaneberger Verlag in Munich, works with expert committees and auction results to validate varieties. A listing in Michel is considered a de facto proof of legitimacy. michel postzegelcatalogus