Wayne Chen (USA) confirmed that black prints from the Denmark, Faroe and Greenland joint souvenir sheets [T20210812] related to Czeslaw Slania became available at respectively 100, 1,800 and 11,000 samples. He could provide pictures of the three items signed by the engraver Martin Mörck. Faroe’s and Greenland’s black prints were distributed to stamp subscribers from both countries while Denmark’s black prints were essentially given to the main participants of the issue, and the rest sold within minutes.