1959, envelope 3c blue, additionally surcharged with 1c maroon, as well as three postcards 4c with the same inverted (two with different surcharge position) or double (one inverted) surcharge, all are post office fresh, unused, VF and scarce (Image)

1954, entire air letter sheet 10c royal blue, the second issue with additional word ''Aerogramme'' (in order to conform UPU regulations), perfin ''D & S Sample'' (Dennison and Sons Co.), fresh and VF, only 96 such samples were made (Image)