THESE ARE A VERY NICE EXAMPLE OF TAGGING ERRORS. INSTEAD OF THE NORMAL TAGGING ON BOTH SIDES OF THE STAMP THERE IS ONLY ONE BAR ON THE LEFT ON ONE STAMP AMD ONE BAR ON THE RIGHT ON THE OTHER . THIS OCCURRED ON SCOTT 544 THE 8 CENT CENTENNIAL DEFINITIVE STAMP THAT WAS ISSUED DECEMBER 30, 197 . BOTH STAMPS ARE USED AND IN NICE CONDITION. FOR OTHER ITEMS OF PHILATELIC INTEREST ESPECIALLY ERROR STAMPS PLEASE VISIT MY OTHER ADS.