San Francisco (Model Post Office Sta.) Cal./Oct. 26, 1915/Registered. Two strike of violet double circle handstamp with inverted date slug (Bomar SF15-06) on reverse of 1915 cover to Cleveland, franked with 1907 5¢ Jamestown in combination with 1915 2¢ + 5¢ Pan-Pacific tied by San Francisco Model Post Office machine cancel (Bomar SF15-02), cover also cancelled with San Francisco Model Post Office duplex cancel (Bomar SF15-01), Extremely Fine and attractive, a wonderful combination of Expo. markings. Estimate  $200 - 300. $0 (Image)