1850. Proof of an essay for 4 RBS. Engraved by M.W. Ferslew. Negative black imprint of the engraving. Full impression of the printing block. Thin laid paper without gum. ONLY 3 SUCH IMPRESSIONS EXIST AND ONLY 2 IN FULL BLOCK FORM. Ex. Lorentzen and Tuori. Cert. Møller AIEP [ E1Dc ] [ (*) ]