Hi OP,
Worn down means to me an Overall Pretty bad condition. In this particular case starting with the bezel, being full of foreign DNA, bezel insert scratched (rare to find and Pretty expensive), the lume tip is lost and only restoring the bezel would exceed the total value of the watch.
Take the majority suggestion here serious and walk away from that watch. There are so many better pieces than this one here.
Wish you good hunting
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