San Francisco, Cal/Nov. 20, 1915/Model P.O. Sta. Numeral "1". Duplex cancel (Bomar SF15-01) tying 1¢ Pan-Pacific with the 2¢-10¢ Pan-Pacific values tied by oval "San Francisco Model Post Office" cancel (Bomar SF15-05) on cover to Washington state with attractive multicolor Expo. label in the upper left, Very Fine and attractive, a scarce combination of markings on the complete Pan-Pacific. Estimate  $300 - 400. $0 (Image)