Heuer Carrera 12 Dato Ref 2547The New Old Stock Triple Date Heuer Chrono This triple date chrono is fantastic never worn, never opened and a true time capsule ! The Heuer 2547 is a chronograph wit a triple calendar function the watch shows date through an additional mounted central hand, which reaches to the outer brim of the dial. The day and month are shown under twelve oclock through two windows. All three are adjusted through 3 small pinholes at the side of the watch case.