 
                            
                    Auction: 15USA - The William H. Gross Collection                                                                                         
                    
                    Lot: 108
                
                    
                        S.G. #3a, 1876 6p Blue green, with ""S"" of ""Montserrat"" overprint inverted, a magnificent mint example of this important rarity, of which only two are believed to exist, fabulously well centered, deep luxuriant color, o.g., extremely fine for this; the key rarity of Montserrat; 1981 BPA certificate; described in Linn´s Philatelic Gems (pages 76-77); ex-Melat, Prappas and Gibralter (Scott #2e; $9,   Estimate US$ 7,200-9,000                        
                                            
                
                    
                        Sold for                    
                        
                        
                        $12,350