1851. 4 RBS FERSLEW 1A. Plate II, no. 11/21 with unretouched crowns. Pair on small 2.rate cover from Kalundborg 13.1.1852 to Sjelle pr.Aarhus. Covers with pairs from this first part of the Ferslew printing are extremely rare, a maximum of 3 letter are known to exist. Pos. 21 slightly touched at SW. Certs. Nielsen and Møller BPP [ 1 ] [ ✉ ]