ITALY, 1933 BALBO'S TRANSATLANTIC FLIGHT ISSUE IN SE-TENANT MATCHING BLOCKS - "LEON(E) & VERC(ELLONI)'- MINT NEVER HINGED, C48-49, gorgeous centering, pristine and extremely fine, scarce in matched block sets and listed as such at a substantial premium in Sassone, cat. $1,150.00 as just pairs, Sassone €3,000.00 as a block set