Nice watch! Your watch/model is indeed an exception to the rule regarding plots/dial patina. As you know the predecessor (16550) had dial paint issues which turned the paint to a cream color causing Rolex to workout this defect. Who knows what happened around this time period mid-late 1980's because the "Fat Lady" also had dial defects but were not received as well as the color change of the 16550...LOL
The 16570, rarely will you find a matching set of plot/hands and when you do... you raise an eyebrow.
Case and point, see the two examples below one previously for sale by NBTimes (enough said there, a topic of many discussions in other forums..) and HQ Milton, which in IMHO the hands were redone..
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