"Wedding of Prince Umberto of Savoy with Marie José of Belgium" in Rome, 8 January 1930. 1930 stamp of Italy with changed color overprinted for use in Tripolitania (western region of the Italian Colony of Libya) the same year. The same stamp exists overprinted for use in Cyrenaica (eastern region of the Italian Colony of Libya).
More information in: http://en.wikipedia.org/wiki/Umberto_II_of_Italy
More information in: http://en.wikipedia.org/wiki/Umberto_II_of_Italy