I've been trying to locate a catalog# for this little pain in my... I know there was a normal printing run done in the late 1950's just after her succession to the throne. The only variants it gives are for an overprint and a precancel. I can't find a reference to the imperf. If this is an Imperf, I did notice the possible trimmings on 3 sides.
Michel: CA 281
Scotts: CA 329
Stanley Gibbons: CA 454
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