Airmail cover from British India to Republic India

KGV, 1931,&nbsp;Air Mail, 1a (Inaug. of New Delhi 1931) 1a (brown), Air mail Sigon Mark &quot;Across the BAY, and over the YOHMAS to RANGOON, With the American Fliers Messers Ross Hadley and John, Pratt in their Plane the N. R. 8809&quot;,&nbsp;signed by pilot John Pratt &amp; Ross Hadley on front, Cancelled with PARK STREET &ndash; CALCUTTA, 28 Mar 31, Cancelled on 3 MAR 31. Violet pictorial cachet and instruction mark &ldquo;Held up till 1st&nbsp;April, Owing to Unforeseen Circumstances&quot;, Excellent Condition.&nbsp;

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