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They could have done something like one of these?
There is no need to add the King's cipher as his portrait already identifies the reign.
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Any chance that he isn't pictured with a crown because they haven't done the coronation yet? Might that be a thing?
Absolutely not! Except for Queen Victoiria, who had been crowned before the adhesive label was introduced on 6 May 1840, definitive stamps preceded the coronation. On one occasion the coronation occurred later, on the day of issue.
Monarch First definitive Coronation
Edward VII 1 January 1902 9 August 1902
George V 22 June 1911 22 June 1911
Edward VIII 1 September 1936 never
George VI 10 May 1937 12 May 1937
Elizabeth II 5 December 1952 2 June 1953
As Bobby De La Rue concluded, all reigns had either a crown or diadem as part of the design.
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I'm sure there's previous Great Britain definitive stamps without a crown or diadem?
You are not far off the mark. The stamps for the reign of King Edward VIII did not place the crown over the head of the king as had been the tradition.
After the abdication of King Edward VIII, this was considered a bad omen. On the stamps for the reign of King George VI, the crown was placed over the head of the King again.