Rolex routinely replaced tritium dials with Luminova and later Super-LumiNova dials during service, and the practice continues today. A service dial is technically a genuine Rolex part but immediately halves the value of a vintage watch versus an original tritium dial in matching patina. Signs of a service dial include: mismatched luminous tone versus the hands, printed 'Swiss Made' text (vs 'T Swiss T'), and stark white luminous plots on a matte dial where the hands still show cream tritium patina. Always compare dial and hand aging in bright light before buying vintage.