Lot
2276 
Special Delivery, 1917, 10¢ ultramarine, pink back, left margin block of 4 with plate number, o.g., right pair h.r., fresh with rich deep color, strong pink hue on reverse, F.-V.F., according to the Scott catalog, pink backs are scarce and worth approximately four times more than the value of a normal stamp. Scott Nos. E11 var. $85 for normal.