The new Breguet Classique Hora Mundi ref. 5727 ref. 5727BB/12/9ZU in 18K white gold is the perfect successor to the previous iteration of the Hora Mundi ref. 5717 —only available in rose gold or platinum. The Breguet Classique Hora Mundi ref. 5727 is a very easy to use world timer in terms of functionality and one of our all time favorites when it comes to classical design. Still fitted with a robust 43mm case like its predecessor, the new Hora Mundi ref. 5727 maintains all the Breguet design cues including the delicately fluted caseband and the welded lugs with screw bars.