The Longines Heritage Diver is a re-issue of models intended for underwater diving produced in the 1970s. Like the original models, these new creations have a diameter of 43 mm. This model is fitted with calibre L633.5 and shows the hours, minutes and seconds with the date at 3 o'clock, set off by a black, satin-finish dial. The bidirectional rotating inner flange is activated using the crown at 2 o'clock. It is graduated from 0 up to 60 minutes, enabling the diver to calculate how long he or she has been under water. This model is fitted on a black synthetic strap.