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 Northwest St. Louis Northwest Tr. 6 1910 SL-12B PC. Saint Louis county. SR101222 $10.00
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 Northwest St. Louis, Mo. Northwest Tr. 2 1912 SL-12C PC. Saint Louis county. SR120113 $10.00
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 Northwest Northwest St. Louis, Mo. Tr. 8 1912 SL-12B PC (McKinley High School, St. Louis, Mo.). Saint Louis county. SR121023 $10.00
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 Northwest Circuit St. Louis, Mo. Northwest R.P.O. Tr. 8 1909 SL-12B PC. Saint Louis county. SR090213 $10.00
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 Northwest Circuit St. Louis, Mo. Northwest, R.P.O. Tr 4 1911 SL-12C PC. Saint Louis county. SR110213 $10.00
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 Northwest Circuit St. Louis, Mo. Northwest, R.P.O. Tr 4 1911 SL-12C PC. Saint Louis county. SR111202 $10.00
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 Northwest Circuit St. Louis, Mo. Northwest, R.P.O. Tr 4 1912 SL-12C Some edge wear. Saint Louis county. SR120610 $10.00
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 Northwest Plaza Sta. Northwest Plaza Sta. Saint Ann 63074 1981 4-bar Postal Card Philatelic. Saint Louis county. MO810518 $10.00
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 Nursery Nursery 1912 doane 1/1 1892-1926 PC. Saint Louis county. MO121127 $30.00
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 Oak Ridge Oak Ridge 1903 cds Registry Receipt Card. Cape Girardeau county. MO030919 $10.00
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 Oakland Oakland 1909 doane 2/2 1865-1955 PC. Laclede county. MO090914 $10.00
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 Oakwood Sta. Oakwood Sta. Hannibal 1954 4-bar DPO Postal Stationery Envelope. Marion county. MO541019 $10.00
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 Odessa Odessa 1912 duplex PC. Lafayette county. MO120706 $10.00
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 Ohio Ohio 1930 4c-bar 1878-1941 PC. Saint Clair county. MO301222 $15.00
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 Olathe Olathe 1906 doane 2/- 1895-1908 Postal Card. Douglas county. MO060815 $50.00
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 Olive Circuit St. Louis, Mo. Olive Cir. Tr. 6 1907 SL-10A PPC (Shaws Garden, St. Louis) Top right corner clipped. Saint Louis county. SR070129 $20.00
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 Olive Hill Olive Hill 1911 4a-bar 1910-1912 PC. Johnson county. MO110411 $50.00
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 Olive Street St. Louis, Mo. Olive, R.P.O. Tr. 6 1908 SL-10B PC. Saint Louis county. SR081231 $20.00
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 Olive Street St. Louis, Mo. Olive, R.P.O. Tr. 2 1910 SL-10B PC. Saint Louis county. SR100216 $20.00
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 Olive Street St. Louis, Mo. Olive, R.P.O. Tr. 4 1912 SL-10C PC. Saint Louis county. SR120129 $20.00
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