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 Oakland Oakland 1938 machine 5c Roosevelt Bureau to Australia. Alameda county. CA380124 $10.00
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 Oakland Oakland 1940 machine 5c Monroe Prexie to Switzerland. Alameda county. CA400111 $10.00
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 Oakland 1c Washington Prexie (3) 1949 Oakland, Calif. QSL W6FDK Card Treaty rate to San Jose, Costa Rica. Pinhole. 1c Overpaid. Alameda county. PX491123 $10.00
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 Oakland 1c Jackson Prominent Americans with 6c Flag Over White House and 8c Airliner Over Capitol 1970 Oakland, Calif. Airmail to Cartagena, Colombia. Returned undelivered with hs Devolution and blue boxed checklist on reverse. Reverse Label tied showing a Whooping Crane. EUROPEAN SIZE. Alameda county. QM700700 $20.00
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 Oakland Sta. D 5c Roosevelt and 10c Monroe Fourth Bureau 1924 Oakland (Sta. D), Calif. Registered to Gorlitz, Germany. Alameda county. QH240110 $20.00
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 Oceanside Oceanside 1943 machine 5c Monroe Prexie to Australia U.S. Censor. San Diego county. CA430430 $10.00
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 Orange 2c Washington Shield 1908 Orange, Cal. PPC c/o American Express Co. Forwarded to American Express Co., Napoli, Italy. Orange county. QE081228A $15.00
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 Orange 1 1/2c Washington Circular Die Wrapper c1931 Orange, Cal. 315 to Hohenlimburg, Germany. Orange county. UP310000 $10.00
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 Orcutt Orcutt 1891 target 1890-1896 2c Washington Small Banknote to Mexico with violet sl Return To The Writer in pointing hand and violet italicized No reclamada Rough at top and some edge wear. San Diego county. CA!910514 $60.00
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 Orleans Orleans c1925 duplex 5c Roosevelt Fourth Bureau to Germany. Humboldt county. CA250726 $10.00
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 Oroville Oroville, Cal. 1921 American Flag Type A14 2c Washington Franklin PC to Germany Some discoloration. Butte county. CA210223A $10.00
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 Pacific Grove Pacific Grove, Calif. 1909 American Flag Type B14 2c Washington Franklin PPC to Germany. Monterey county. CA091101 $10.00
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 Pacific Grove Pacific Grove 1935 machine 2c Washington Fourth Bureau on 1c Jefferson Large Wreath Postal Card to Finland. Monterey county. CA351004 $15.00
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 Pacifica 11c Jetliner and Globe Air Letter 1963 Pacific, Calif. Airmail to Hamburg, Germany with violet sl Retour and reverse violet boxed Non Reclame Nicht Abgeholt. San Mateo county. UP630727 $15.00
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 Palo Alto Palo Alto 1938 machine 3c Washington 1934 and 2c Washington Fourth Bureau to France Corner card California Bureau of Juvenile Research. Santa Clara county. CA380901 $10.00
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 Palo Alto 2c Washington International Envelope c1957 Palo Alto, Calif. Printed matter to Brisbane, Australia. Corner card Chinese Native Evangelistic Crusade. LEGAL SIZE. Santa Clara county. UP570000A--LS $15.00
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 Palos Verdes Estates Palos Verdes Estates 1958 machine 1925-1962 10c DC-4 Skymaster Air Letter to Netherlands. Los Angeles county. CA580423 $10.00
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 Pasadena Pasadena, Cal. 1905 American Flag Type B14( ) 2c Washington Shield PC to Belgium Forwarded within Belgium Some discoloration and edge wear. Los Angeles county. CA051118 $10.00
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 Pasadena Pasadena, Cal. 1924 Universal Machine Type Fiftieth Anniversary Pasadena All The Year 1924 1c Franklin Fourth Bureau on 1c Green Jefferson Postal Card to Austria Crease. Los Angeles county. CA240523 $10.00
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 Pasadena Pasadena 1931 numeral duplex 5c Roosevelt Fourth Bureau Airmail to Canada. Los Angeles county. CA310810 $15.00
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