sentences:  These were done by a number of different printers in various cities resulting in a variety of styles, fonts, and colours in the overprints.A few overprints were used to create commemoratives; these include the 1941 issue for the 30th Anniversary of the Republic, and the 1943 North China Japanese occupation issues to commemorate the Return to China of Foreign Concessions.Sun Yat-sen has been highly revered by all political sides for having ended the old dynasty system of China.