International registered air mail letter to North America (category IIIa) < 5 gr.
Postage rate 30 öre, air mail fee 0 öre and registered mail fee 25 öre
Air mail label printed and crossed, registered mail label type 4:1 and currency control label
Transit and arrival postmarks: New York 31/12/50 and Chicago 02/01/51
01/04/48 - 31/05/51