Great Britain 1992 50p ochre "Machin" (ACP/PVAD) error, SGX991ab.
A very fine unmounted mint, with full original gum, block of six, the right hand vertical pair imperforate and the adjacent pair partially perforated.
A very scarce progressional piece showing the imperforate error.
GB Specialised Catalogue No: U430a.
The Stanley Gibbons catalogue value for a standard imperforate pair is £1,400.
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