Legit Rolex Explorer 6150 dial or re-dial

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Greetings vintage pros,

I would appreciate any thoughts and advice on this Rolex. This Explorer, ref 6150 (seen between lugs and on case back), has an unusual dial: an underline and "officially certified chronometer" (which is generally seen in 6350s). I am interested in buying the watch. The owner has had it in his family since new, in 1953. He reports that is was given to Rolex in 1962 and they removed and replaced the radium with Tritium.

Question: Does this make sense? My understanding is that the underline indicates tritium on the dial (1961 or so and later). Would Rolex do as he said (relume with Tritium) and add the underline to the 1953 original dial? Or does an underline mean something else here? Or, did Rolex replace the dial in 1962 with a 6350 dial that was lying around the shop (and then place the underline)?

G IMG_1027-2.PNG IMG_1028-2.PNG IMG_1030-2.PNG IMG_1032-2.PNG rateful for any thoughts.