Australia
Used in Papua New Guinea, Treated as Unpaid

This aerogramme (Stein A-36) was written on board SS Himalaya. SS Himalaya was a British passenger ship of the Peninsular and Oriental Steam Navigation Company, launched in 1948, which operated mainly between Britain and Australia. The aerogramme was fed into the postal network at RABAUL (cds 1 JY 72).

Regardless whether posted on the high seas (in this case, a British aerogramme had to be used) or while anchoring at Rabaul, Papua New Guinea (in this case, a PNG aerogramme had to be used), the aerogramme was correctly treated as unpaid.

The PNG postal authorities taxed the aerogramme “T 20 c / 7 c”, where 20 c is double the deficient postage (10 c was the aerogramme rate in 1972) and 7 c is the first weight step surface letter rate to Australia.

There are no signs that the postage due was collected by the Australian postal authorities.


References
Stein stands for Stein, The Aerogrammes of Australia and its Depedencies 1944-1980

Credits
Thank you, Allan, for identifiying the ship name.