Cook Islands 550-552, 552a sheet

Cook Islands 550-552 ad blocks, 552a sheet of 12, MNH, $11.35. Michel 669-680, Bl.101, Euros 21.00. ZEAPEX-1980: Sir Rowland Hill overprinted: Postrider, Stagecoach, Automobile, Streamlined train, Cap-Horniers, sailing ship, River steamer, Liners "Deutchland", "United States", Balloon Neptune, Junkers, Graf Zeppelin, Concorde.