16c Dark Blue, Air Post Special Delivery (CE1 var). Wide top plate no. F21315 block of six, with gum applied to both sides, bottom row with about 50% gum applied, full on top row, well-centered, diagonal natural pre-printing paper crease, small adhesion on top right stamp and top row with gum skip, otherwise Very Fine, a scarce error in a choice format with gum applied to both sides of stamps, with 2009 P.F. certificate

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