Denmark. (Great Britain). 1862. Envelope written from London dated '6th October 1862' addressed to Aalborg bearing Denmark Yvert 8, 4k brown tied by 'K.D.O.P.A./ Hamburg' duplex with Aalborg arrival on reverse. Interesting item posted in the Royal Danish Post Office in Hamburg. The 1854 British letter rate to Denmark via Belgium was 10 1/2d / 1/2 oz. This letter was carried to Hamburg to evade postage.