Sweden. Facit 233a on air mail cover, Registred air mail cover sent from Lidingö 3.3.1936 to Avellaneda (Argentine) franked with 8.45 SEK (1x233a, 1x254, 3x257). A number of postmarks on both sides of the cover (Trelleborg- Sassnitz, German air mail cancellation, Buenos Ayres, Avellanded).