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9 September 2015 - 1st class Amethyst Purple with Security Backing Paper
Issued to mark the occasion on which Her Majesty Queen Elizabeth II will become the longest serving monarch of this country.
The retail book of 6 x 1st was issued on the same date as the miniature sheet and counter sheet.
These stamps had year code 015R under the chin, and source code (REI)GS behind the neck. The Source code on these stamps is partly hidden by the security cuts.
SG number probably U3745 (renumbered from 3746)
At the beginning of February 2016 booklets were found with the new security printed backing paper, with the 2015 year code O15R.
In March 2016 this new printing with year code O16R was available - this is the new 2016 printing.