Ceylon 50 c aerogramme (Wiegand #27), issued in 1969, used after independence in 1973, when the aerogramme rate was 90 c. Consequently the aerogramme was taxed as short paid. "80" in the tax fraction's numerator stands for double the deficiency, "60" in the denominator for the first weight step international letter rate.
The international letter rate in the US in 1973 was 15 ct, so multiplying the tax fraction with this rate results in the 20 ct postage due, which was endorsed in the boxed postrage due handstamp.
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