SLQ Struck Through Grease?

For this one, I am going to theorize a deliberate dip in Nitric acid. A Grease Fill that deep would cause all detail in the area to disappear, yet this coin shows traces of underlying detail in the sunken areas. That's indicative of two things: One, that there was originally detail present above the recessed areas and two, just how deeply the strike affects the density of the metal inside the planchet.

The other, less-affected areas on the surface look like deliberate but lesser applications of the same acid. I think some kid was playing with Daddy's chemistry set.

I couldn't figure out how the marks on both sides got there post mintage but it just dawned on me that some one could have clampmed it in a vicegrip while it was dipped. The fumes rose and caused the latent marks under the jaws of vice. Thanks for the help. nlp