Each "article" in this category is a collection of entries about several stamp issuers, presented in alphabetical order. The entries are formulated on the micro model and so provide summary information about all known issuers. See the :Category:Compendium of postage stamp issuers page for details of the project. Hadhramaut Refer Qu'Aiti State in Hadhramaut Haiti Dates 1881 – Capital Port-au-Prince Currency 100 centimes = 1 gourde Main Article Postage stamps and postal history of Haiti Hamburg Dates 1859–1867 Currency 16 schillings = 1 mark Refer German States Hanover Dates 1850–1866 Currency (1850) 12 pfennige = 1 gutegroschen; 24 gutengroschen = 1 thaler (1858) 10 pfennigs = 1 groschen; 30 groschen = 1 thaler Refer German States Hatay Dates 1938–1939 Capital Alexandretta Currency (1938) 100 centimes = 1 piastre (1938) 100 santims = 40 paras = 1 kuru Main article Postage stamps and postal history of Hatay Haute Volta Refer Upper Volta Hawaii Dates 1851–1898 Capital Honolulu Currency 100 cents = 1 dollar Main Article Postage stamps and postal history of Hawaii Heilungkiang Refer Kirin & Heilungkiang Hejaz Dates 1916–1926 Capital Mecca Currency 40 paras = 1 piastre Refer Saudi Arabia See also Hejaz-Nejd Hejaz-Nejd Dates 1926–1932 Capital Riyadh Currency (1926) 40 paras = 1 piastre (1929) 110 guerche = 10 riyal = 1 gold sovereign Refer Saudi Arabia See also Hejaz Heligoland Dates 1867–1890 Capital Currency (1867) 16 schillings = 1 mark (1875) 100 pfennige = 1 mark Hellas Refer Greece Helvetia Refer Switzerland Herm Refer Channel Islands Herzegovina Refer Bosnia & Herzegovina Hoi-Hao (Indochinese Post Office) Dates 1902–1922 Currency (1902) 100 centimes = 1 franc (1918) 100 cents = 1 piastre Refer China (Indochinese Post Offices) Holkar Refer Indore Holland Refer Netherlands Holstein Dates 1864–1867 Capital Kiel Currency 16 schilling = 1 mark Refer German States Honduras Dates 1866 – Capital Tegucigalpa Currency (1866) 8 reales = 1 peso (1878) 100 centavos = 1 peso (1933) 100 centavos = 1 lempira Main Article Postage stamps and postal history of Honduras Hong Kong Dates 1862 – Capital Victoria Currency 100 cents = 1 dollar Main article Postage stamps and postal history of Hong Kong Hong Kong (Japanese occupation) Dates 1945 only Currency 100 rin = 1 sen; 100 sen = 1 yen Refer Japanese Occupation Issues Horta Dates 1892–1905 Capital Currency 1000 reis = 1 milreis Refer Azores Territories Horthy Regime Refer Szeged Hrvatska Refer Croatia Hungary Dates 1871 –