On December 28, 2023, the last joint issue of the year was released by Oman and Saudi Arabia, which celebrated the opening of the land road between the Sultanate of Oman and the Kingdom of Saudi Arabia. Both countries issued one stamp and a miniature sheet with 6 stamps. Oman issued a souvenir sheet as well. The stamp represents the two heads of states, Haitham bin Tariq Al Said, Sultan and Prime Minister of Oman, and Salman bin Abdulaziz Al Saud, King of Saudi Arabia, the highway, a palm tree and several investment projects (information provided by Bu Khalaf, Kuwait and Kenneth Sequeira, Singapore).