India
Short Paid Aerogramme to the U.S.

Aerogramme (Wiegand no. 4) sent from JULLUNDUR (cds 1 SEP 1950) to Philadelphia, U.S.

The aerogramme rate to the U.S. was 10 As in 1950, so the aerogramme was short paid 4 As.
 
Top left of the “T” handstamp, the post office clerk in India endorsed “23 cms” which was crossed out and replaced by the correct “46 cms”, as double the deficient postage (8 As) was converted into 46 UPU gold centimes at a rate of 3 As 6 pies = 20 UPU gold centimes, with 1 As = 12 pies.

The U.S. postal authorities applied the h/s “Postage Due ... Cents / Foreign Sect. G.P.O.N.Y.” and endorsed a postage due of 16 cents. Consequently, a 10 c and two 3 c postage due stamps were affixed.

The postage due of 16 cents was calculated based on 3 UPU gold centimes = 1 c, which, arithmetically speaking, led to a postage due of 46 / 3 = 15.33 c which was rounded up to 16 c.


References
Wiegand stands for Wiegand, Katalog der Aerogramme von Asien, 2000