1984D RPM?

[GrumpyEd]

To use the scratches as a good marker they need to match line by line not only similar ones in a similar direction.
I can not make out if they match from the pics.

[willbrooks]

What about the 45 degree die scratches that run in the same direction on both coins.

Those are called flow lines, and they will appear on every single coin in the same direction, radially toward the rim. I'm also confused because I don't even see an overlay here. An overlay is supposed to show both coins blended together. I see a picture of coppercoins coin, then I see another picture of coppercoins coin with more brightness, then I see a picture of coppercoins coin on top on the OP's picture, not blended, with the dates rotationally skewed versus each other. Assuming you lined up the mint marks with each other, which we don't know because we can't see them both, this should be proof to you that it isn't the same die, because one mint mark is rotationally oriented differently than the other. As I said earlier, I don't know how you can have any high degree of confidence in an overlay of 2 pictures that were taken at different points above the coin as these 2 were. I see Bob's arrow in the coppercoins listing pointing to the upper split serif. The OP's coin does not have this! The doubled vertical on the coppercoins picture stays consistently vertical. On the OP's coin it cuts into the device on the lower portion. They're simply not the same. If I'm wrong, it won't be the first time or the last time, but I don't see anything productive coming out of further discussion at this point, so I am locking the thread. If the OP wants to explore it further, he can explore setting up an in-hand examination with Bob for an attribution.