1903, 5¢ blue + 8¢ violet black. Tied by oval handstamp on registered cover to Auckland, New Zealand, purple "Oakland, Cal., Registered, Jun 19, 1906" cds and San Francisco registry exchange label (Scott #FX-SF1b), appropriated transit backstamps, Very Fine, a scarce exchange label with only 13 recorded usages. Scott No. 304+306  Estimate $100 - 150. $0 (Image)