THIS BLOCK OF 10 STAMPS SHOWS A VERY NICE EXAMPLE OF A G1Ar TAGGING ERROR, WITH ONE BAR TAGGING ON THE RIGHT SIDE OF THE STAMP AND THE LEFT SIDE UNTAGGED. IT OCCURRED ON THE 8 CENT SLATE CENNTENNIAL STAMP ISSUED IN 1971. THIS BLOCK IS MINT AND UNHINGED AND IS IN VERY NICE CONDITION. FOR OTHER ITEMS OF PHILATELIC INTEREST ESPECIALLY ERROR STAMPS PLEASE VISIT MY OTHER ADS.