1915 Panama California Exposition (San Diego, Ca.). A nice balance lot of covers with Expo. cancels & advertising, Expo. cards, etc., included is a one album full of covers showing virtually all of the slogan machine cancels from the various cities of usage, plus a large & diverse range of mint & used Expo. cards, mixed condition, inspection is a must! Estimate  $500 - 750. $0 (Image)