First up is two illustrated cards by an artist named Browne from Expo 58 in Brussels, Belgium, which was the first major world's fair after World War II.1
Second, these two postcards from Japan feature woodblock prints by Tomikichiro Tokuriki.
1. Expo 58 was also known as the Brussels World’s Fair, Brusselse Wereldtentoonstelling or Exposition Universelle et Internationale de Bruxelles. As an interesting aside, Orson Welles' "Touch of Evil" was awarded top prize at Expo 58.