The "dress" finish on any pipe will wear down over time. Peterson, Stanwell, Dunhill, Ascorti, Castello and all. Not quickly, but from being held in hand the finish / stain on any pipe will show signs of fading. If left in direct sunlight, the finish will also fade / alter over time.Yeah it’s amazing that the color is made of bugs.
I don’t have any advice but I’m sure someone will chime in shortly. Maybe @briarblues?
It's nothing to be concerned about. Most often as the "dress" finish begins to fade you'll end up with a really nice contrast finish.