Further Investigation. Unlisted Scott. Stamp has to be held on an oblique angle to the light source. Queen type of 1970 with redrawn portrait, and type of 2006,with iridescent overprint of "Royal Mail" (and Coded) in wavy lines.
(Scanner will not pick up these wavy lines)
Self adhesive with oval slits.
Unlisted Scott, or....Scott has included this stamp in the 2013 list (MH426)
There is an error somewhere because this stamp has the code "ROYAL M12L" Indicating a 2012 release.
Aha! Update with Nigel's link. The 2012 code was released January 2013..........all solved!
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