Isn't this called split plating? The D.

You can see it inside and outside of the d It's something cool though.

 

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Yes, it is called split plating. It occurs when the copper coating doesn't properly adhere to the zinc and splits away on the edge of a letter. It doesn't add any extra value, but still a nice find.

 

I'm glad you posted that I have one exactly like it and was wondering

 

You're getting good at this

 

Thank you!