16c Dark Blue, 16c Red & Blue, Air Post Special Delivery, "Specimen" Overprint (CE1S-CE2S). Each with diagonal "Specimen" overprint in green, stamps affixed to small ledger piece as is the case with the Universal Postal Union (UPU) specimen reference sets from the Portuguese postal authority in Lisbon, each with trivial light toning and surface scrapes, No. CE1 with light gum staining at right edge, Fine, no more than nine examples were distributed, of which very few have survived, each with 2000 P.F. certificate

Image Magnifier / Download

Power Search for Comparables