A special first day of issue postmark was available for Italian Air Force centennial (joint issue with Vatican City and Italy), issued on 23 March 2023.

Designed by Giancarlo Federico, it represents the Italian and the Sovereign Military Order of Malta cockades, painted respectively on the wing and fuselage of the SIAI Marchetti S.83 “Marsupiale” aircraft given by the Italian Air Force to the Order of Malta in the second half of the 1940s.
The postmark is completed by the inscriptions “SOVRANO MILITARE ORDINE DI MALTA”, “POSTE MAGISTRALI” and “GIORNO DI EMISSIONE”, the legend “CENTENARIO DELL’AERONAUTICA MILITARE ITALIANA” and the date “23.III.2023”.

Items for reposting, individually franked by the sender with stamps belonging to the relevant set, must reach Poste Magistrali by 23 May 2023. 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 6 April 2023 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.