San Diego, Cal/Exposition Sta. Numeral "1" duplex cancel (Bomar SD15-01) on five different covers (all from the same correspondence), all with Pan-Pacific frankings in combination various other commemoratives including 5¢ Jamestown, 1¢ & 2¢ Trans-Miss., 2¢ Hudson-Fulton, etc., four with Exposition labels, one cover registered with unusual straight line "Found in ordinary mail" & backstamped with "San Diego" registry handstamps, one stamp with trivial defect, Very Fine and attractive. Estimate  $500 - 750. $0 (Image)