Core Of A Coin Uses Grid?

This could very easily be a substantial "stuck-in" Strike thru grease. Sometimes the grease will have debris and other matter in it. Acetone would totally remove it and possibly ruin its character if it is genuine. Just knock some off and see if the devices are missing,if they arent,its doodoo
Refer to this article

The black on this coin is above the design, see how it sits on top of the 1?

If the design under the crud is there, then it is not a striking error. If it blocked the design, then it is a struck though grease issue. On the 1995 above, note the reverse? All the devices are present. That tells me that under the crud, the obverse design will also be there, just covering the coin. Plus as mentioned, it should show the design of the die, not the crisscross pattern like a wafer cookie. IMOHO

Too late, it has already happened.