As precision instruments used for special missions and covered by military secrecy, some watches made by Panerai in the 1940s had no indication on the dial apart from the hour markers. But other models carried names referring to the luminous substance used on the dial —such as Radiomir or Luminor— or of the institution which had commissioned the watches, such as the Italian Navy. Inspired by these elements, the new Panerai Luminor 1950 3 Days in a limited edition of 1,000 pieces, features the inscription 'Marina Militare' on its dial.