What caused this toning?

Nice toned commem
This coins looks a little like the toned Silver Eagle from another post. What type of storage cause this - do you think? Curious as to your opinions...
I wondered WHAT method....
This coins looks a little like the toned Silver Eagle from another post. What type of storage cause this - do you think? Curious as to your opinions...
I wondered WHAT method....
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Comments
Russ, NCNE
A coin doctor who did a lousy job.
Sorry, but you need to learn before you get burned.