I know a number of people who have had watches restored by Longines. This work has included movement restoration, dial refinishing, and even dial reproduction. The work can be done to a very high standard but bringing this dial, "back to its original glory," is out of the question, in my opinion. To someone with a casual interest in Longines, the result will look nice. But, if you really appreciate the nuances of the design, leaving it in its present condition is the best option. I think that the dial looks great.
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