HAITI, 1933, 60c on 20c VIOLET BLUE BOYD-LYON NEW YORK - PORT-AU-PRINCE FLIGHT SURCHARGE IN BLOCK OF FOUR MINT NEVER HINGED, #C4A, showing small differences in the overprints between the four stamps, fresh and fine-very fine, a scarce air post multiple, signed Kessler twice on the bottom right stamp indicating his consideration that this is a multiple that should say intact, cat. $600.00 as four mint never hinged single stamps