San Diego, Cal/Dec. 23, 1916/Exposition Sta. Numeral "1". Duplex cancel (Bomar SD16-01) tying 2¢ Washington-Franklin on cover addressed to the "San Joaquin Valley Building, c/o P.C.I.E., San Diego ", cover with small 1916 Expo. advertising in blue, Very Fine, a scarce usage during the 1916 extension of the Exposition. Estimate  $150 - 200. $0 (Image)