There are two 2 kr wine-red Three Crowns and a 20 öre green-black St Stephan, the Stable-Boy on the cover summing up to 4.20 kr. The letter was sent by air and it was also a registered letter. The postage rates for air mail have varied a lot over time and depending on which country. It is quite a research effort to sort that out, unlike surface mail that had a flat rate for every country since 1874.
|Air mail to Argentina fee: 1.70 kr + registered fee 2,50 kr|
1971, 23 April. 20 öre green-black St Stephan, the Stable-Boy. Qty: 36,200,000
1969, January 20. 2 kr wine-red Three Crowns. Qty: 67,700,000
But there is one thing we know for sure - the fee for registered letter: 2.50 kr. Then the air mail fee must have been 1,70 kr to Argentina in the fall of 1972. The registered fee was raised to 2.50 kr as of 1 October 1971.
The letter was dealt with at the Post Office Stockholm 1 the General Post Office at at Wasa Street on Thursday 30 November 1972. When Señor Juan Lukan received the letter is unknown.