294a, 1¢ PAN-AMERICAN EXPO ISSUE, INVERTED CENTER ERROR, F-VF OGHR, short perforation at right and lightly toned paper. About (250) known. CV is for poorly centered stamp with minor faults. VERY SCARCE! Cat($12,500) (Image)

$11,000

1594a, 12¢ Red Brown on Beige, Lower Left Plate Block of 4 no. 37930, Tagging Omitted ERROR, VF-XF NH, cv for four singles Cat($40) (Image)

$60