£300
1929 (Dec 30) Jodhpur to London first flight, cover franked 1a (3) + Air 6a, with boxed "AIR MAIL / KARACHI - DELHI / FIRST FLIGHT" cachet applied in error. Brown states "one example known of the outward flight cachet Karachi-Delhi used in error on the return flight at Jodhpur". Very unusual, possibly unique.
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