2008-D Monroe President dollar with thin edge lettering explanation please

[amnight]

I was wanting to know what happened to the edge lettering and what caused what looks like a ridge on the edge of the coin? Thanks in advance!

[amnight]

More pics.

[diamond]

I'm not quite sure. The abnormally thin letters could be due to excessive spacing between the lettering die and the impeller. Or they could have been crushed after the lettering was applied as the coin was rolled and squeezed in some mechanical device. Or perhaps both factors were at work. The "ridge" on the edge could be evidence of post-production damage. Hard to say without a close-up look under a microscope.

[amnight]

Thanks for the reply Mike, it is much appreciated!
-Steve