Atypical rim on this coin

I've just taken this piece out of the flip for the first time, and I note the roughness of the edge.  It's partially smooth with edge lettering, and partially rough/unfinished.  It's slightly “light” as well, at 10.93 grams.

Thoughts?

Thanks,

CJ

How thick is it? 

Depending on the point I measure, around 2.04 - so very close to the published thickness.

Thanks for looking into this with me.

CJ