Issuers
starting with O
17 stamp-issuing authorities in our directory. Each guide covers the issuing period, the inscriptions to look for, popular series and value ranges.
- 1861–1861 Oakway Oceania Guide
- 1892–1894 Obock Africa · Inscribed OBOCK Guide
- 1945–1945 Occupied Berlin (Allied Control Council) Europe Guide
- 1892–1893 Oil Rivers Protectorate Africa · Inscribed OIL RIVERS Guide
- 1849–1871 Old German States Europe · Inscribed BAYERN Guide
- 1852–1862 Oldenburg Europe · Inscribed OLDENBURG Guide
- 1925–1926 Oltre Giuba (Italian Somaliland South of Juba) Africa · Inscribed OLTRE GIUBA Guide
- 1971–present Oman Middle East Guide
- 1945–1946 Opd Dresden (German Local Post) Europe Guide
- 1945–1946 OPD Erfurt (Oberpostdirektion Erfurt) Europe Guide
- 1945–1946 OPD Halle (Oberpostdirektion Halle) Europe Guide
- 1945–1946 Opd Leipzig (Soviet Occupation) Europe Guide
- 1945–1946 OPD Schwerin (Mecklenburg-Vorpommern) Europe Guide
- 1868–1902 Orange Free State Africa · Inscribed ORANJE VRIJ STAAT Guide
- 1902–1910 Orange River Colony Africa · Inscribed ORANGE RIVER COLONY Guide
- 1913–1939 Orchha (Princely State) Asia · Inscribed ORCHHA STATE Guide
- 1980–1980 Outer Seychelles Africa Guide
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