Oops.
Just looked at the innerlid with a linen tester. It really is too small to see unaided. It is more apparent in the image I uploaded strangely.
The 4 symbols say:
International Exhibition London 1902
King Edward VII • Queen Alexandra • Coronation 1902
Patria
Exposition Internationale Paris 1902
The centre of the cross says:
International Exhibition • London 1902
Both references to London have some further text, in brackets, but is unreadable.
I was assuming that on becoming King he would no longer be the Prince of Wales.
I understand that Edward VII was particularly concerned with improving anglo/french relations.
Maybe they were commissioned specifically for the exhibitions, though I can't find a 1902 exhibition in either Paris or London. There was an Exposition in Paris in 1900 and a Franco-British Exhibition in London in 1908.