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World of motorcycleS |
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| O&H (Australia) | 1912-1915 | |
| Oakleigh (England) | 1910-1914 | Gracesguide - Oakleigh |
| OASA (Italy) | 1930-1932 | woiweb.com - Oasa |
| OB (Austria) | 1904-1907 | . |
| Oberle (Germany) | 1927-1929 | . |
| OCMA (Devil) (Italy) | 1953-1957 | woiweb.com - Ocma |
| OCRA (Germany) | 1923-1925 | . |
| OD (Ostner Dresden) (Germany) | 1927-1935 | . |
| ODA (Germany) | 1925-1926 | . |
| ODRA (Poland) | 1957 | . |
| OEC (England) | 1901-1954 | Gracesguide
- OEC
Yesterdays - 1925 680cc 2 cyl Yesterdays - 1928 750 cc Yesterdays - 1938 Commander 500cc |
| Ofran (Germany) | 1923-1925 | . |
| Ogar (Czech) | 1934-1950 | . |
| OGE (Germany) | 1921-1924 | . |
| O'Grady (Australia) | 1902 | . |
| Ogston (England) | 1914 | Gracesguide - Ogston |
| OHB (Germany) | 1927-1928 | . |
| OK/OK supreme/OK junior (England) | 1899-1934 | Gracesguide
- OK Supreme
Dogdragons Photo's 1933 Special Yesterdays - 1931 K32 500cc Yesterdays video clip - 1927 |
| Okey (Australia) | 1910-1916 | . |
| OKUR (ORUK) (Germany) | 1922 | . |
| Oliva (Italy) | 1920-1923 | woiweb.com - Oliva |
| Oliverio (Italy) | 1929-1932 | woiweb.com - Oliverio |
| Olivos (England) | 1920-1921 | Gracesguide - Olivos |
| Ollearo (Italy) | 1923-1952 | woiweb.com - Ollearo |
| Olmo (Italy) | 1954-1961 | woiweb.com - Olmo |
| Olympic (England) | 1902 to 1905 & 1919-1923 | Gracesguide- Olympic |
| Olympique (France) | 1922-1958 | lesmotocyclettes - olympique |
| Olympus-King (Japan) | 1956-1960 | . |
| OM (Germany) | 1923-1925 | . |
| OMA? (Italy) | 1952-1955 | . |
| OMB (Italy) | 1932-1934 | woiweb.com - OMB |
| OMC (Italy) | 1933-1935 | woiweb.com - OMC |
| OMC (England) | 1930 | Dogdragons
Photo's
Gracesguide - OMC |
| Omega (I) (England) | 1909-1910 | Gracesguide - Omega |
| Omega (II) (England) | 1914-1927 | Dogdragons
Photo's
Gracesguide - W.J.Green & Co |
| Omega? (Italy) | 1950-1953 | . |
| Omega (Japan) | 1960's | . |
| Omer (Italy) | 1968-? | woiweb.com - Omer |
| OMN (Italy) | 1924-1925 | woiweb.com - OMN |
| Omnia (Germany) | 1931-1933 | . |
| OMT (Italy) | 1907-1913 | woiweb.com - OMT |
| Onaway (England) | 1905-1908 | Gracesguide - Onaway |
| Onoto (France) | 1922-1954 | . |
| Opel (Germany) | 1901-1930 | . |
| Opitz (Australia) | 1912 | . |
| Opra (Italy) | 1927-1929 | woiweb.com - Opra |
| OR (Italy) | 1928-1931 | woiweb.com - OR |
| Orani | ? | woiweb.com - Orani |
| Orbit (England) | 1913-1924 | Gracesguide - Orbit |
| Oreol (France) | 1903-1914 | . |
| ORI (Germany) | 1923-1925 | . |
| Orial (France) | 1919-1926 | . |
| Orial (see Triumph & TWN) (Germany) | 1929-1931 | . |
| Orient (USA) | 1900-1906 | . |
| Origan (France) | 1933-1950's | . |
| Original-Krieger (Germany) | 1925-1926 | . |
| Oriol (Australia) | 1915? | . |
| Orion (Czech) | 1902-1933 | Yesterdays - 1905 450 cc |
| Orione (Italy) | 1923-1928 | woiweb.com - Orione |
| Orionette (Germany) | 1921-1925 | Gracesguide - Orion |
| Orix (Italy) | 1949-1954 | woiweb.com - Orix |
| Orle (Poland) | 1939 | . |
| Ormonde (England) | 1900-19o4 | Gracesguide - Ormonde |
| Örnen (Sweden) | . | . |
| Ortless (Germany) | 1924-1926 | . |
| Ortona (England) | 1905-1906 | Gracesguide - Ortona |
| ORUK (Germany) | 1922-1924 | . |
| OSA (Poland) | 1958-onwards??? | |
| OSA-Liberty (France) | 1926-1932 | . |
| Osborne (England) | 1901-1909 | Gracesguide - Osborne |
| Oscar (England) | 1953-1954 | Gracesguide - Oscar |
| Oscar (Italy) | 1965-1982 | woiweb.com - Oscar |
| Oscha (Germany) | 1924-1925 | . |
| Osmond (England) | 1902-1925 | Gracesguide - Osmond Cycle Co |
| Ossa (Spain) | 1949-1985 | . |
| Ostner Dresden (see OD)(Germany) | 1927-1935 | . |
| Otten (Netherlands) | 1901-1911 | . |
| Ottino (Italy) | 1926-1931 | woiweb - Ottino |
| Otto (Germany) | 1921-1937 | |
| Ottolenghi (Italy) | 1928-1932 | woiweb.com - Ottolenghi |
| Over (Japan) | 1988-onwards? | . |
| Overdale (Scotland) | 1921-1922 | Gracesguide - Overdale |
| Overseas (England) | 1913-1915 | . |
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