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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