Submariner Dial

[turner050]

So I bought a Rolex Submariner 14060M several months ago from a very reputable online retailer of second-hand Rolexs. Everything's been great with it except I noticed something a few weeks ago thats been bothering me ever since. The bottom part of several letters in "Oyster Perpetual" are slightly dim. Please see the attached photo (Sorry, that's the closest and clearest I could a shot of it). The "R" of oyster and the "PER" of perpetual have a bottom third that doesnt seem consistent with the rest of the text - its a tad darker. Now I know this watch is getting towards 20 years old, and this is probably just part of the dials age. But when you pay this much for a watch you can easily notice this stuff. I'm a relative beginner in fine watches so I'm probably just overthinking it. Am I looking at this too closely? What do you guys think? Again, this was purchased from a highly regarded site, so I would be surprised if anything illegit came from there.