1943 Walker Surface, what's wrong?

I have this 1943 Walker with a porous surface, raised lines, bumpy as heck, etc. I have considered that it might be fake, might have been dipped too long, might be mint related, etc. It does not appear to be recently cleaned, at least not to me. I have read the attached excerpt from an article on NGC...

"Almost everyone's short list of favorite coin types includes the Walking Liberty half dollar. The United States Mint didn't share that view, however, as coins of this type were very difficult to strike; even proofs sometimes lacked complete details.

The Mint's Engraving Department attempted to correct this problem by sharpening the obverse master hub on several occasions, but the fundamental problem of poor metal flow into the dies proved insurmountable. This fact presents a challenge when attempting to grade Walking Liberty halves, as many of the pieces coined during the 1920s and earlier seem worn even when fully lustrous. This also is true of some of the branch mint issues of the '30s and '40s, particularly those coined at the San Francisco Mint."
https://www.ngccoin.com/coin-grading-guide/Grading-Walking-Liberty-Half-Dollars.aspx

Any help would be appreciated.

 

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if i had to guess, a baking soda bath that lasted wayyyyy too long

 

I think some chemical has attacked the copper (10%) in the coin, but not reacted with the silver, leaving the coin porous and fuzzy-looking.

 

I think some chemical has attacked the copper (10%) in the coin, but not reacted with the silver, leaving the coin porous and fuzzy-looking.

 

I know lemon juice reacts negatively with copper. I can go try it out on some junk silver

 

No clue really. But it would get bounced probably for environmental damage. Just a guess, but it doesn't look like any treatment I've seen before.

 

Amazing the detail that's left , sure wish it was left alone as it was one heck of a well struck coin . Definitely soaked in something caustic . Too bad .

 

There are some straight lines going across the coin horizontally and vertically and in between.
Is that from some type of rubbing?

 

Bad cleaning job, whether it was baking soda bath, dip, etc...Now it's only worth it's silver content (junk silver)

 

Not by me. I really have no idea. Coin surface looks lustrous, bumpy and hazy. Does not look recently polished. Most lines look raised to me.

 

Some kind of chemical or acid damage