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6 x 1st class amethyst purple booklet - security backing paper
Issued 9 September 2015 to mark the occasion of Her Majesty Queen Elizabeth II will become the longest serving monarch of this country
Printed by Walsall Security Printers, source code (REI)GS, year code O15R
Inside front cover has a portrait of The Queen, as on the first day cover, with the slogan 'Happy and Glorious'. The legend, 'Long to Reign Over Us' is on the edge strip.
The cylinder numbers - W1 (amethyst purple) W1 (iridescent) W3 (phosphor) - are hidden by the front cover (see picture)
At the beginning of February 2016 booklets were found with the new security printed backing paper. These have the 2015 year code O15R.
New booklets with year code 016R were available from April 2016.
SG GB Concise 2016 catalogue number - new number allocated MB15, which covers both O15R and O16R booklets, so our number is MB15.6