10c Blue, Special Delivery, Plate Proof on Card (E2P4). Complete left pane of 50 with imprint and plate no 73 at top and bottom, deep rich color, some creasing along edges of plate impression far from designs, including one slightly broken at bottom right, light vertical crease touches top right proof

VERY FINE. AN EXTREMELY RARE COMPLETE PANE OF 50 OF THE 1888 SPECIAL DELIVERY ISSUE PLATE PROOF ON CARD.

This is the first example of a complete pane of the 1888 Special Delivery plate proof on card to appear in Power Search since our 1982 Rarities sale. Scott Catalogue lists but does not price a plate block of this proof. Scott value as blocks of four and singles is $1,800.00, which does not remotely capture the rarity of this complete pane

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