Bidspirit auction | 1928 (3 April) illustrative Registered

1928 (3 April) illustrative Registered Airmail First Flight Cover of Imperial Airways Service Calcutta- England tied with KGV 1½a pair & 2a block of 4 having right bottom stamp with stop under 'S' on right value ERROR (Sg no: 205, CV-£350) from Karachi to Sutton Coldfield, Large cover of Calcutta Philatelic Mart with KGV Re 1 illustration printed on reverse; violet boxed illustrative cachet depicting the map; tear at top left corner