Lot 10926A – UNIQUE Partial Double Surcharge Unused 1933 $4.

UNIQUE Partial Double Surcharge Unused 1933 $4.50 Balbo Flight Surcharge, partial double surcharge, near-coincident but clearly and plainly visible in the numbers of the date and value, position 1 of the setting and the only one known thus, shows partial offset of the surcharge on reverse as well, part og, a magnificent showpiece with only one example of the variety known but on cover (ex Cyril Harmer), small surface mark at left (seems to be from the surcharging process), very fine in all respects, 2010 cert. BPA (Unitrade C18iii, priced on cover only)