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John(Tx) said:I have dug many dimes like that in brackish and saltwater...HH
ironsight said:If that dime indeed was erroneously minted with no nickel plating, how are you going to prove the fact?
Dug up many modern clads with absolutely no trace of nickel but in otherwise good copper condition.
Depending on the soil and its chemical composition, that nickel plate can totally disapear in a matter of a few years or less.
The soil composition could of possibly been more corrosive to nickel than copper.
Just cause its a '69 doesn't mean it was dropped back then. It could of been saved in a piggy bank when it was new then dropped a couple years ago.
I agree with GeorgeinSC, get it appraised by a professional if you think its the real deal.
ironsight said:A couple thoughts
You could of put it under a high power microscope looking for any remnants of nickel.
Possibly a chemist could of performed non-destructive testing for traces of nickel oxide or other nickel compounds.
But you polished it likely destroying any evidence of nickel.
Extreme cleaning and especially polishing a potentially valuable coin will reduce sometimes drastically its numistic value.
Unless you have a coin dealer relative or friend, i myself don't trust coin dealers to evaluate and price coins.
Just for kicks, you got nothing to lose by having a coin dealer at least look at it.