1851. 4 RBS Ferslew. Plate II, no. 71–74. Fantastic STRIP OF 4 on cover from København 8.12.1851 to Hamburg. Probably sent by ship (no side-canc.). Each stamp with SUPERB mute canc. The first 3 stamps with unusually wide margins, last stamp a bit close at bottom. Very few similar covers are known and this is one of the best ones. Exhibition item. Cert. Nielsen [ 1 ] [ ✉ ]