Sweden. Air mail cover Facit 143E, 145A, 181, 231 cover, 5+3x10+20 öre on beautiful registered air mail cover sent from HÄLSINGBORG 20.7.31 to Great Britain. Arrival pmk CHANCERY LANE B.O. 21.JY.31. Correct postage 25 öre + reg. 20 öre + air mail 10 öre.