Wow....i Thought Canadian Stamps Were Hard To Identify..

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In February 2009, security features were increased on "Machin" self-adhesive stamps to avoid the reuse of uncancelled used stamps retrieved on mail. Both the effigy and the background were printed with continuous "ROYAL MAIL" iridescent printing. Two ellipsoidal shear panels were added to each stamp and the water soluble layer between the stamp and the adhesive was abandoned. These two later features were intended to render the stamps difficult to take off mail and to store for reuse (but in effect are easily overcome by the careful use of a sharp knife edge). Collectors are advised to not attempt to soak such stamps off, but to save them on pieces cut from the envelope.

The security features also included a minute change to the background printing of "ROYAL MAIL" where one letter is replaced to identify the source of the stamp. For example, instead of "ROYAL MAIL" in one place in the upper right of the stamp is printed "FOYAL MAIL" to indicated that that stamp came from a booklet of four stamps. This feature made it easier to identify the source of an individual, used stamp and track down production problems.

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You reckon it is a Yanks only link?