One more quarter a 2006 D Nevada the back legs of the farthest horse back I looked a PCGS guide for picture reference and there is a difference there I'm going to try to include the screen shot from Wexler's. Let me know what you think.
Well, Doubling has a rounded edge, not a sharp 90 Degree edge. Might be machine doubling. But to be honest, I'm not sure this information also involves the figures, just lettering. Let hope someone with more experience can answer.
No added value. Any doubling that is NAV is basically worthless, such as nut mot limited to MD or machine doubling, DDD, hub doubling, etc. They occur so easy and it happens so much it's worthless doubling.