A special first day of issue postmark was available for “World Environment Day” issued on  23 March 2022.

Designed by Giancarlo Federico, it reproduces the image on the souvenir sheet.
The postmark is completed by the inscriptions “SOVRANO MILITARE ORDINE DI MALTA”, “POSTE MAGISTRALI” and “GIORNO DI EMISSIONE”, the legend “GIORNATA MONDIALE DELL’AMBIENTE” and the date “23.III.2022”.

Items for reposting, individually franked by the sender with stamps belonging to the relevant set, must reach Poste Magistrali by 23 May 2022. A suitable self-addressed envelope, bearing Order of Malta stamps corresponding to the ordinary (Posta4) or priority (Posta1) mail  rate in force in Italy, must be enclosed for the postmarked items to be returned under cover. For return by registered mail, please contact Poste Magistrali in advance.

Items to be returned uncovered must reach Poste Magistrali by 8 April 2022 and must be individually marked “Corrispondenza filatelica” (Philatelic correspondence) on the address side in indelible ink. In case of missing, it will be automatically applied by Poste Magistrali.