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April 2011 - no specific date of issue, but first discovery.
Security Definitive stamps with U-shaped cuts and iridescent text.
12 x 1st class gold booklet - first issue with year code M11L and source code MTIL
Printed by Walsall Security Printers.
Printers imprint on reverse now removed
Wide (7.55mm) edge strip.
SG catalogue number MF5b - also used for 2010 issue.