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細節
                                        
                                            used  (1d.) slate-blue horizontal pair with close to large margins, both lightly cancelled "21"; horizontal crease at foot not affecting very fine appearance. B.P.A. Certificate (2001). Sc. 11; S.G. 18, £1350. Photo
                                        
                                    來源
                                        
                                            A. Caspary, 1957