1915 Panama-Pacific International Exposition (San Francisco, Ca.). A nice balance lot in four albums of covers with Expo. cancels & advertising, Official Expo. Committee corner cards, entrance tickets, souvenir pamphlets, etc., the main focus of the collection is the different slogan machine cancels from the various different towns of usage, mixed condition, please inspect. Estimate  $1,000 - 1,500. $0 (Image)