Since 2009 many Machin Definitives have been produced as self-adhesive Stamps with enhanced security features including semi-circular slits and an irridescent overprint.

This is the 1st class from booklet of 6, coded MSIL M11L, first discovered in March 2011.

SG Catalogue/Norvic cross-reference table - click here. See other blog entries for the history of the development of security Machins.