The Stamp dedicated to Nicolaus Copernicus on January 29, 2023 by Poland has just to be considered as a lure for joint issue collectors ;-). In the meantime several friends from the Netherlands, Poland, UK and Italy provided information about the issue of the true joint issue related to the 550th anniversary of the birth of the astronomer Nicolaus Copernicus (Mikolaj Kopernik; 1473-1543). Both Poland and the Vatican State will issue on February 27, 2023 a souvenir sheet showing the painting “Conversation with God” (1872) from Jan Matejko (1838-1893) showing the astronomer surrounded by all his tools.