Great Britain 1938 ½d Emerald (Watermark GVIR sideways), SGD27var.
Very fine unmounted mint with full original gum imperforate left hand corner marginal C38 control block of four imprimaturs with "BPMA" handstamps on reverse.
Some gum disturbance confined to sheet margin from original mounting of sheet by the post office, nevertheless a unique positional piece.
