5 June 2017 - 50th Anniversary of the Machin Definitive 6 x 1st class deep scarlet retail booklet
As in 2007 Royal Mail have released an ordinary retail booklet with an illustrated inside cover as part of their issue to mark the 50th Anniversary of the Machin Definiitve. This booklet must have been printed late in 2016 as although the year code is M17L, the backing paper has original security backing paper (SBP1)
Printed by Walsall Security Printers, source code MSIL, year code M17L.
Single from booklet.
SG number probably U2968da as used for previous years.