9 September 2015 - 1st class Amethyst Purple
Issued to mark the occasion on which Her Majesty Queen Elizabeth II will become the longest serving monarch of this country.
These stamps are coded 015R under the chin, and (REI)GN behind the neck.
Choose any number of single stamps,
or Cylinder block of 6
or date block of 8 dated 05/06/15
If your choice is shown as out of stock, please ask.
SG number probably U3744 (renumbered from 3745)