GB QEII 1988 Barcode Cylinder "Window" Booklet GP1, Code N, £1.90p, (issued 23 August 1988), containing pane of Machin stamps - 10 x 19p. Round tab. Barcode No. 5 014721 200088. Cylinder No. B7. Laminated covers. Printed by Harrison.  Excellent example in fine condition.