2 – Germany – 2023 – Bundeslander series – Hamburg – A
2 – Italy – 2023 – The 150th anniversary of the death of Alessandro Manzoni
2 – Italy – 2023 – The 100th anniversary of the Air Force
2 – France – 2023 – Olympic Games Paris 2024
2 – Luxembourg – 2023 – The 25th anniversary of the membership of Grand Duke Henri to the International Olympic Committee
2 – Luxembourg – 2023 – The 175th anniversary of the Luxembourg Parliament
2 – Slovakia – 2023 – The 100th anniversary of the first blood transfusion in Slovakia
2 – Germany – 2023 – The 1275th anniversary of the birth of Charlemagne (748–814), King of the Franks and Holy Roman Emperor – J
2 – Germany – 2023 – The 1275th anniversary of the birth of Charlemagne (748–814), King of the Franks and Holy Roman Emperor – G
2 – Germany – 2023 – The 1275th anniversary of the birth of Charlemagne (748–814), King of the Franks and Holy Roman Emperor – F