Berkeley Cal. May 31 1912, machine cancel with partial 1915 Pan-Pacific Expo wavy flag cancel (SF15-23) ties 10¢ green (E7) and 2¢ Washington on cover to San Francisco, pink "Fee claimed at / San Francisco, Cal." two-line handstamp and matching San Francisco Special Delivery (5.31) time clock arrival backstamp; light vertical fold, clean and F.-V.F. Estimate  $150 - 200. $0 (Image)