There is an even rarer version the Rolex military issue submariner. It features an Explorer style dial in a submariner case. Here is my interpretation of that dial. All of the hour markers are luminous, including the "3", "6", and "9". The "Circle-T" symbol displayed is used by the British MoD to symbolize the use of Tritium, but incorporated here as purely a design element. Non-radioactive SuperLumiNova is featured on this dial.