9 September 2015 - LONG TO REIGN OVER US FIRST DAY COVER
Issued to mark the occasion on which Her Majesty Queen Elizabeth II will become the longest serving monarch of this country.
The miniature sheet with 1st class gravure Machin in Amethyst Purple and four other stamps printed in intaglio/recess which have the Machin head and:
1st class William Wyon's City Medal of Queen Victoria
1st class Doroth Wilding portrait of Queen Elizabeth II
£1.52 The Badge of the House of Windsor, featuring the Round Tower of Windsor Castle
£1.52 The Queen's Personal Flag, created for use in Commonwealth Countries in 1960.
The definitive Machin stamp is coded 015R under the chin, and (REI)GM behind the neck.
First Day Cover with miniature sheet, and single stamps from the Counter Sheet (REI)GN and retail booklet of 6 (REI)GS
SG numbers probably MS3744, U3745 and U3746