Fraser's Nabil El Jammal in London and Stuart Larsen worked in close partnership to bring the sale to a successful conclusion.
The 72.6m yacht is due to be delivered from Proteksan Turquoise in 2011.
NB54 is a full displacement yacht with a steel hull and aluminium superstructure. She features exterior and interior design by H2 Yacht Design.
NB54 can accommodate 14 guests in seven cabins and has a range of 7,000 nautical miles at 12 knots.