1988 (10) Castle High's - Benham SPG 7 (Windsor) Official - With PRINT FLAW Error

Rare and apparantly unlisted (on cover) Benham SPG 7 (Windsor) Official - With PRINT FLAW Error.....

The £1 Carrickfergus stamp has a Green Ink Line running from thebright of the 'A' up almost 1½ cm into the stamp....

The 'Stamp' is known with this defect, but it's NOT listed as being on any cover... until now !!

Code: 62661