Radium was combined with zinc sulfide, which allowed for a brighter glow than pure radium alone. You can see this on a number of vintage Rolex watches that have managed to survive to this day and still have their original luminous dials
What also set the Rolex Sky-Dweller Replica Watches apart from most other Rolex watches was the size. Even though the case design continues to be the Rolex Oyster that we know and love, Rolex produced it in a 42mm wide case, making