VERY FINE. A RARE BLOCK CONTAINING THE "CANAL ZONE" OMITTED ERROR. ONLY TEN STAMPS WERE PRINTED IN TOTAL.
According to Canal Zone Stamps, the error was caused when the sheet was misfed into the press. The overprint was omitted from the bottom row of the plate.
EXTREMELY FINE AND RARE SET OF CANAL ZONE AIR POST SMALL DIE PROOFS.
There are reportedly only two examples of each value in existence. Ex Salz