6 x 1st class deep scarlet retail booklet on Security Backing Paper type 2
A reprint of the Padlock booklet of 6 x 1st was available from June 2017. Unlike the Machin Anniversary booklet issued on 5 June, this one is printed on SBP2.
Printed by Walsall Security Printers, source code MSIL, year code M17L.
Single from booklet.
SG number probably U2968da as used for previous years.