Kennedy Toning question...

I saw a Golden toned 1981-S Type 2 Proof 68 DC at the Atlanta show last month...the dealer said that it had been left in an underground vault...reason that it had toned this way...I had never seen a toned Kennedy in that color and thought about buying it...but later when I went back to the table to show it to my friend that was attending the show with me, he had sold it. Is this something common? It looked very strange. Any info?
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<< <i>Light golden toning is not at all unusual--stunning toning would be. Can you describe the colors a little more? >>
This was dark-golden toned...much darker than the GAE or the sacagawea...this might be a bit of a stretch...but have you ever seen an old trumpet or trombone that is a darker shade of brass than the shiny new ones? kind of that color...sorry I can't give a better example.
From 1970's thru the early 80's for some reason, many of the Kennedy proofs took on this golden tone...not unattractive but still an over all toning.
I have no idea what the dealer was talking about when he mentioned "under ground vault" (could have been a root celler) could have been a bank vault in the basement, could mean anything and it could mean why that particular coin toned that color. It's all speculation at this point but an enviroment of this nature could have had a dramatic effect on a clad proof.
An MS-68 Type II 81-S to me would have been a nice coin and probably had a nice price to go with it.
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