6 US 25 cent Air Mail
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1948 block New Value in Gold, OVP black 10.00 cents on 2.5 dollars, Scott IM 831May 31, 20261948 block New Value in Gold, OVP black 10.00 cents on 2.5 dollars, Scott IM 831May 31, 2026US 1861 1 cent Franklin, blue, National Bank Note Co., Scott US 63May 31, 20261923 US Eight Cent Pre Cancel Stamps 2pcMay 28, 20261917 U.S. Postage Due, 10 Cents Carmine Lot, Perf 11, Scott J65May 31, 2026US 1875 Scott RO-135d, 1 Cent F. P. Newton - Match & MedicineMay 31, 20261873 6 cent Lincoln, Continental Bank Note Co., Scott US 159May 31, 20261863 US 2 cent Black Andrew Jackson, Scott #73, Blue Cancel "Killer"May 31, 20261861 U.S. Bank Note Issue, Benjamin Franklin orange 30 cent, Scott 71May 31, 2026US 1875 Continental Bank Note 2 cent, strong Killer Quincy III, Scott 178May 31, 20261876 Cuba Scott 68b Alfonso XII 25 Centimos Ultramar IssueMay 31, 20261919 Poland 25 Pfennig Generalgouvernement Overprint PL13bII UsedMay 31, 2026French Syria 1945 Fiscal Overprint "POSTES SYRIE" 25 Piastres Scott 307May 31, 2026US 1924–1925 Canal Zone Overprints Scott 70 71 74 US PersonalitiesMay 31, 2026Cuba 1878 King Alfonso XII, 25 c green, Scott CU 73May 31, 2026US 1869 National Bank Note Co., 12c green, Bullseye cancel, Scott US 117May 31, 2026 
