![unmounted mint  12/6d. grey and yellow (7th. printing), [51] with sheet margin at foot, fine unmounted mint. R.P.S. Certificate (1968). S.G. 120d, £600. Photo](https://www.christies.com/img/LotImages/2001/SKS/2001_SKS_01269_0271_000(023300).jpg?w=1)
Details
                                        
                                            unmounted mint  12/6d. grey and yellow (7th. printing), [51] with sheet margin at foot, fine unmounted mint. R.P.S. Certificate (1968). S.G. 120d, £600. Photo
                                        
                                    Special notice
                                        
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