1952 BOAC REGULAR COMET SERVICE JOHANNESBURG to LONDON - FIRST RETURN FLIGHT: Special souvenir Air Letter form with map of the routing printed on reverse. Addressed "By BOAC 'COMET'". Postmarked Johannesburg cds 4.V. 52. on despatch. VF, surprisingly uncommon for this period and these souvenir forms the highest-rated items within the series listed by Burrell. See additional image.
