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From 17 February 2009 1st and 2nd class Machin Definitives and higher-priced 'make-up' values at 50p and £1 were produced as self-adhesive stamps with enhanced security features including semi-circular slits and an iridescent overprint.
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 the 1st class from books of 6 issued 31 March 2009 with security print ROYAL MSIL. SG U2951