I got ahold of a copy of the "Cavallino - the journal of Ferrari history" - "Ferrari Royale". It's available in the download folder. It's an edition about the 250 GT Speciale Coupe owned by prince Bernhard. It does include a nice overview of all his Ferrari's. See snapshot:
Again the Dutch Ferrari register had a unique picture stored of this 400i with Bernhard on it. Remarkably the number plate does not match. It should be JK-69-LN.
Just for the records, another unique picture of Bernhard and Pininfarina in his shop: