Always fun to find an LWC! As Sal points out, what you are seeing there is Machine Doubling or machine damage. It's an illusion to real doubling caused by some slop in the equipment and tooling rather than doubling in the working die. No premium for that, but it is a strong example of MD for your future reference.
Considered "worthless doubling," of which there are several kinds. Read up and see what some of them are, so you'll know in the future. http://doubleddie.com/144801.html
Flat and shelf like so that means it’s machine doubling and that’s not the type of doubling you want. It’s a nice one and would be good for educational purposes.
@Regina D Mcmullen Definitely not a Doubled Die variety. The correct answers given by the other members.
I will say some of the most pronounced machine doubleing I have seen, and well photographed (that level of detail can be diffcult) but as said above... nothing special unfortunatly