UNITED KINGDOM of GREAT BRITAIN & NORTHERN IRELAND £ 1 BANK NOTE (QEII & SIR ISSAC NEWTON- both SIDES are VISIBLE ) in STAMPED / POSTMARKED ( MOUNT PLEASANT )WINDOWED ENVELOPEwith MAP & INFO. MEASURE APPROX 23 x 29.5 CMS ( the serial number shown in our picture is not the one you will receive )