PHILIPPINES: 1926 Madrid-Manila Flight 2c to 10p Scott #C1-15 (ex the rare 16c Sampson), most with large-part o.g., guarantee handstamps of A Roigl and Alberto Diena, Cat US$3000. Alberto Diena Certificate (1973) for the 4p & 10p. (14)

Grade A (Image1)

Estimate AU$750