THIS IS A NICE EXAMPLE OF A DOUBLE ERROR. NOT ONLY IS THE STAMP MISPERFORATED BUT IT HAS ONLY ONE TAGGING BAR DUE TO THE MISPERFORATION. THIS OCCURRED ON SCOTT 840 THE 17 CENTS WOODEN HORSE CHRISTMAS STAMP ISSUED OCTOBER 17, 1979. THE STAMP IS USED AND IS IN NICE CONDITION. FOR OTHER ITEMS OF PHILATELIC INTEREST ESPECIALLY ERROR STAMPS PLEASE VISIT MY OTHER ADS.