Thank you guys, I to thought when looking at it from the left side it looks like a D because it has the middle "hole" like the D, and takes on the shape of a smushed D. But looking at it from the right side it shows the portion of the "6", so it appears to be stamped on the mass. Sorry, I thought it was a misplaced mintmark. Even if it is a Die chip, It is so cool because it looks a little 3-D.