Quick search for stamps:
On October 21, 2019, Belgium Post issued a miniature sheet in honor of the 75th anniversary of the country's liberation during World War II.
On October 16, 2019, Japan Post issued a mini sheet in honor of the 150th anniversary of the Japanese-Austrian friendship.
On October 9, 2019, the Portuguese Post issued the 4-series of stamps dedicated to the 500th anniversary of the Portuguese Postal Service.