Need Advice On Cleaning/Conserving This Lovely Coin

Just a brief followup:

I couldn't help myself. Washed first with diluted dish soap then a baking soda and aluminum electrolysis bath. Took off the sulfur oxide and left the silver.

Now a really lovely mint luster and a sharp cartwheel on both sides. Couldn't be happier with the result.

Believe me, we've ALL been there!

At least the "pie" toning on the reverse is mostly gone now.

I still think it's been dipped a few times over the last 40 years and the mint luster is long gone. If you like it is really all that matters though.

It's a nice type coin till a better one comes along!

This will labeled as "Harshly Cleaned" if it were to be graded by TPG.

From the image I suspect the mint luster/cartwheel is gone.

"This will labeled as "Harshly Cleaned" if it were to be graded by TPG."

Regarding this comment and some others:

The coin looks with the eye... not magnified as in the scans I did... as a lovely AU example with a good deal of mint luster and a true cartwheel shine.

I did not "scrub" the coin with bicarbonate of soda. I used the "electrolysis" method of immersing in a hot water+dissolved soda bath on an aluminum foil sheet. Same as electroplating except this mix transfers the the oxide to the aluminum and leaves the silver intact. Yes, if the tarnish was left long enough, the damage on the surface will still be visible and grade as "cleaned" but the black oxide disappears. This method has no noticeable effect on the mint luster.

If, like me, you want the "eye appeal" to be as close to an uncirculated coin as possible for a simple "type" collection or "year of birth" mint set that looks amazing, give this method a try with coins of low or moderate value.

It's been cleaned at least once, and the reverse is an organic stain which will be difficult to remove without surface damage to the coin. I wouldn't do anything to it other than possibly replace it.