The Ref. 6154 is identical in case and movement to the watches supplied by Rolex to Panerai under the same reference number. The difference between the watch made by Rolex for Panerai and the present model is in the dial. The Rolex dial is a traditional single plate with luminous coated indexes whereas the Panerai dial is a two-plate dial the first plate being coated with luminous material and the second plate pierced through for the indexes and numerals.