Strange Impressions On My Coin

I posted a couple of pictures of this coin before, but for the purpose of honing the grading skills of the members here.

There are some interesting features to this coin though, both obverse and reverse.

The obverse features extensive die cracks and breaks, while the reverse contains not only it's own share of cracks, but raised impressions that baffle many a folk as to their origin.

On dollars, people call them denticle impressions, on bust halves however, I am not sure what the correct term is since bust halves have 'milling' rather than denticles.

These raised impressions, while very similar on both dollars and halves, I feel have different causes due to the different presses that created them.

On this coin, there are several rows of these raised impressions that range through 'AMERICA', below the same, and into the eagle's left wing.

The coin is dark, so I have enhanced the lighting to see the features better.