Sweden. Facit 136 on air mail cover, Registred air mail letter from Grycksbo (County of Dalarna) to Köln (Germany) sent 29.9. 1920, franked with 2 x F136 and 1 x F 137. The postage fee is corect and the letter was sent during the correct period of use for these stamps.Arrival cds Köln 2.10.1920 on the back side. Sealed with five seals.