SG310a. 1938.
4c Scarlet and black. 'Imperforate Horizontal, Vertical Pair'.
Post Office fresh UNMOUNTED mint never hinged with beautiful fresh colour and perfect perforations. ALSO being 'Imperforate to lower sheet margin'.
David Brandon Certificate.
One Of The Greatest Errors Of KGVI And Indeed The 20th Century!
THE FINEST EXAMPLE IN EXISTANCE.