1939 S Mercury Dime Crack Die?

That's pretty cool...it's obviously raised on the coin, so it must have come from the die. It looks too localized to be a lamination defect to me.

Hi,

The first thing that jumps out at me on this coin and another dime that was posted is that someone is harshly cleaning them. The hairline scratches caused by the cleaning is killing whatever value these may have even if they turn out to be errors.

On this coin, without seeing a better picture that shows some depth, I am leaning toward the possibility of a damage of some sort. Look at the rim ding above the R. It is pretty coincidental that whatever that is on the surface of the coin is close to the spot where the rim was damaged.

Thanks,
Bill

I think images of the Obverse would help on both coins. I've never seen marks like this one has before on coins. It is raised like die damage, but I wonder what from the mint would cause this?

Hard to say. They may be die dents. Then again they may be incipient lamination errors that have not yet split. Or they could be gas bubbles beneath the surface. I can't rule out post-strike damage because the "US" of PLURIBUS is flattened, and these letters lie right in the path of the defects.