In my experience the old blue tinted coating was not as robust as the new colourless coating is. Having said that I have seen examples of both that are pristine, and both that are messed up, so it really depends on how you treat the watch.
Once the coating is scratched up, if it bothers you it can either be buffed off completely, or the crystal can be replaced. I have done both based on what the customer wants.
Cheers, Al
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