Doubling or not?

[Rachel68]

I'm new to this, and get confused relating to doubling of any kind. I find under the microscope what looks to be doubling sometimes, but unsure if it's normal to see a coin look this way when the light hits it at a certain angle, or if it means doubling. When I move the coin to a different angle the definition of the shape changes to a thick black line. I've seen pictures and videos that show that as doubling sometimes, but as there are different types/levels, I am unsure. Any help or guidance is greatly appreciated.  Thank you in advance. 

[Greenstang]

No Doubling there. That is just the shoulder of the letters that you are seeing.