Lot 40633 – 1876-79 Ship issue, master die proof in black on glazed

1876-79 Ship issue, master die proof in black on glazed card, printers working proof of the finished design without value, cut down and in sunken mount, thought to be only two examples in private hands (another example being part of the Royal Collection); ex William A. Townsend, John E. du Pont and « Imperium ».