Lot 10227 – 1946 Middle East International Air Navigation Congress 30m with overprint diagonally misplaced and “à cheval” in mint nh lower sheet marginal plate block of 10

1946 Middle East International Air Navigation Congress 30m with overprint diagonally misplaced and “à cheval” in mint nh (mounted in margins only) lower sheet marginal plate block of 10, numbered A/41 with A/39 and A/41 scored out,some toning with patch affecting left two stamp, unique control block from the only sheet of 50 discovered, signed and cert. Hass (1991)