Is This 1964-D Cent An Unlisted RPM Or A Die Chip?

Damage, a well placed hit it looks like. It is thinner in the curve, like something was shaved down. I do see a slight directional shift to the NW which could be slight MD on the date.

Looks more like 1964-D RPM-001 stage 'G'
http://varietyvista.com/02b%20LC%20...4DRPM001.htm

also. VLDS of RPM-001.

What was probably the difference of opinion is that some didn't remember that RPMs change shape as the die ages. Sometimes it gets weaker, other times it gets stronger. I guess it depends on what happens to the die (polishings) or the direction of the RPM. The RPMs to the east side of the mint mark get stronger because of die wear flows in that direction. (SE) So know this, I took a look at the sites images of the die stages of the listing. As the die aged the RPM on the left side started to go away because of die polishing removing the fields. But the inside of the mint mark area usually stays the strongest. So I went looking at the Variety Vista site, and it was the first die with the RPM on that area. But the earlier die stages looked a bit different. So, sometimes you just have to read the whole book to see how the story really ends.