From 17 February 2009 1st and 2nd class Machin Definitives and higher-priced 'make-up' values at 50p and £1 will be produced as self-adhesive Stamps with enhanced security features including semi-circular slits and an irridescent overprint. High Value stamps - £1.50 to £5 - were also issued but before long they were not generally available at post office branches, most of their function being taken over by Horizon labels.
These initiatives are part of the on-going development of security features for Stamps. The slits are designed to inhibit the removal of these Stamps for fraudulent sale and re-use. The overprint features the words 'Royal Mail' in a pattern reminiscent of security features on banknotes.
This is a 50p stamp from ordinary Counter Sheets.
Norvic number 3500 - SG U2916
Cylinder blocks of 6
Date block of 8 - 20/01/09