So it's only visible under high magnification? I cannot for the life of me see whatever it is you are describing. If it is not visible to the naked eye, maybe let it go? If you are concerned about microscopic levels of missing paint, just wait until you scratch it through regular use
Every watch under high magnification will present an "imperfection." Look at any brand new Rolex with painted hour, minute, seconds, GMT hand, and you will see the most minute level of imperfection under high magnification.
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