Outer 1929 Cupar (Fife, Scotland) to Secundarabad India with KGV 6d/1d/½d postage rate and CUPAR CDS 11-AP-29, and backstamped by Secundarabad CDS dated 25-AP-1929.
As can be seen from the accompanying info, flights from London to Karachi had only just opened up, so the additional days to get to Secundarabad shows the difficulties in getting postage out to southern India. Nice piece!