18 September 2015 - 1st class Amethyst Purple from Rugby World Cup Mixed Content Booklet
Issued to mark the occasion on which Her Majesty Queen Elizabeth II will became the longest serving monarch of this country, the Purple Machin is replacing the Royal Mail red in some uses; the counter sheet and retail booklets of 6 have been announced so far.
These stamps have year code 015R under the chin, and source code (REI)GC behind the neck. The Source code on these stamps is partly hidden by the security cuts.
SG number probably U3746 - we've renumbered this on advice.