I am readying The Last Season: 1939 by Ann de Courcy. In it she states that when George VI and Queen Elizabeth visited Canada and the USA in 1939, they were accompanied by the Imperial State Crown.

I have never heard anything of this. I thought that the Crown could not leave the country. Which is the reason the Crown of India was created.

There are a number of inaccuracies in the book, so I assume the is merely one more of these, but... Is anyone aware that the Imperial State Crown may have traveled to North America in 1939?