Patina develops based on the history of the watch. Some moisture maybe, being left in the dark for years ... who knows. I've heard people speculate that lume formulas from certain years are more likely to turn yellow than formulas from other years. Again, who knows, but if very little has developed over 25-ish years, there's no guarantee that will change any time soon. I wouldn't buy a watch with the idea that patina will improve on any type of reasonable time scale. That's just wishful thinking. In watches I have owned, the only really noticeable changes I've seen over time is the growth of moldy areas.
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