Australian 25 c aerogramme (Stein #A-45) sent from Gladesville 6 OCT 1978 to Turku, Finland. Uprated with a 5 c stamp to meet the 30 c aerogramme rate in place since July 1, 1978.
The aerogramme contained an enclosure, as is indicated by the boxed purple “ENCLOSURE” instructional handstamp.
The aerogramme was treated as a short-paid air mail letter, as for a surface mail letter the applicable rate would also have been 30 c. The airmail letter rate to European destinations (zone 5) was 55 c up to 10 g.
Hence, the air mail letter was short paid 25 c. This calculation is visible to the left of the stamp. The 1976 Lausanne UPU congress has allowed member countries to introduce a service fee for underpaid mail items. This regulation took effect on January 1, 1978.
Initially, this service fee in Australia was 16 c, which gives the 41 c that were collected from the sender and are endorsed in the octagonal purple “UNDERPAID / POSTAGE … / COLLECTED FROM SENDER” handstamp.
By mistake, the Finnish postal authorities applied a taxation handstamp that was later voided by scribbles.
References
Stein, The Aerogrammes of Australia and Its Dependencies, 1944-1980
Salt, Underpaid Articles - Service Fee, BSAP Bulletin vol. 53 no. 6 December 19998, p. 116
Credits
Thank you, Allan, for pointing me to the Colin Salt's article.
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