Letter sheet sent from Copenhagen 28 May 1852 to Berlin. Prepaid “26” sk. marked upper right corner, convention transit mark “Aus Daenemarck d. Mecklenburg” in black struck on front and on reverse transit marks “OSTBAHN 29.5 – III T.”, two-ring “BERLIN-HAMBURG 29 5” and boxed “BROMBERG / BAHNHOF / 30 5”.