Sweden. Facit 20, 21 cover, 6+3x12 öre on registered cover sent from ROCKNEBY 7.11.1876 to Hjorted, seemingly one stamp was franked in KALMAR 8.11.1876 due to 2-fold rate and not single rate, for which reason the origin P.O. should settle the missing postage through the after-assessment service. Defects incl. paper loss nevertheless very interesting.