British Antarctic Territory 1971 50p on 10s ultramarine and emerald, SG37w
British Antarctic Territory 1971 50p on 10s ultramarine and emerald, "R.M.S. Shackleton", variety WATERMARK INVERTED, SG37w.
A splendid marginal example from the top of sheet, unmounted mint with full original gum.
A rare watermark variety.
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