8½p UK aerogramme (Greiner/Greiner # ) sent on 19 October 1975 to the US. Since 29 September 1975, the rate for the small size aerogrammes was 10½p. hence, the aerogramme was short paid 2p, which leads to 4p double deficiency in the tax fraction's numerator. The 10p in denominator is the international surface mail rate at the time of posting.
In the US, the tax fraction was multiplied with the US international surface mail rate (20c), resulting in a postage due of 8c.
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