Auction: 24019 - Stamps and Covers of Great Britain
                    
                    Lot: 1665
                
                    
                        Great Britain
King George V Issues
1912-24, Watermark Royal Cypher
2½d. dull Prussian blue on toned paper from the lower left corner of the sheet, unmounted mint and a superb example of this major rarity, exceedingly rare, believed to be the only corner marginal example. R.P.S. Certificate (2022). Spec. N21(18),  £10,000.  Photo.
Note: Since the very first certificate was issued by the Royal Philatelic Society well over a century ago, circa 80 examples of the ½d. Cyprus green have been certified. This compares to less than 20 examples of the dull Prussian blue on toned paper during the same period.
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                        Estimate                    
                        
                        
                        £5,000 to £7,000                    
                    
                        
                            Starting price                        
                            
                            
                            £3500