Auction: 11027 - The Chartwell Collection - Great Britain Line-Engraved Essays, Proofs, Stamps & Covers Part 1                           
                    
                    Lot: 1035
                
                    
                        Line Engraved Essays and Proofs  The Cancellation Experiments  One Penny Black, plate VII, MH  in a greyish shade, small to very large margins and cancelled by a clear and central strike of code "D" c.d.s. dated 1840 (17 May). A fine example of this very rare trail cancel. B.P.A. Certificate (1955). S.G. Spec. DP20G (unpriced)  Estimate £   4,000-5,000                        
                                            
                
                    
                        Sold for                    
                        
                        
                        £4,800