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The guests signatures on headed Balmoral paper in September 1936 - the notepaper was edged in black following the death of his father.
Never before seen private photos of King Edward VIII and his mistress Wallis Simpson on a cruise that triggered the constitutional crisis and his abdication have been discovered.
The photo album of 200 holiday snaps makes up part of an extraordinary treasure trove of gifts and mementoes relating to the controversial couple that was kept by close friends of theirs.
The black and white photos show them swimming in the sea and one of a bare-chested and scrawny-looking Edward posing in front of at a Greek beauty spot.
The items are coming up for sale at Kerry Taylor Auctioneers in London.