Thank you Vincent! When I think logically about it all, I suspect that the Italian media might be worth while exploring as the wedding took place in Palermo, but whether the Italian press would have been interested is another question, although no doubt the press would have reported on the discussions surrounding Prince Christopher's conversion to the Roman Catholic church. Perhaps the family didn't release any information.
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Not a lot I guess, at the time, the french royal family was still living in exile. I remember, princesse Francoise was given a diamond bracelet created by Mellerio by the french monarchists. I found this in the Mellerio archives.