16c Red & Blue, Air Post Special Delivery, Horizontal Pair, Imperforate Vertically (CE2a). Mint N.H. centerline block of four, each stamp with pencil position number on back (22-23/27-28), well-centered, fresh colors, bottom pair with light natural gum crease

VERY FINE. THE UNIQUE CENTERLINE BLOCK OF FOUR OF THE 16-CENT RED & BLUE AIR POST SPECIAL DELIVERY, HORIZONTAL PAIR, IMPERFORATE VERTICALLY.

A single sheet of this error was discovered at a Buffalo N.Y. post office. It was ultimately broken up by H. E. Harris & Co. after showing the complete sheet at the 1947 New York City CIPEX Show. Datz states that 10 pairs are recorded. Very few blocks are known to exist including the unique plate block of six.

With 2001 P.S.E. certificate. Scott Retail as two normal pairs

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