error dime, fun with acid or rust?

found this while coin roll hunting, what is this, and HMIIW?

 

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looked stuff up on ebay.
this coin is worth about $100
how much does it cost to grade it?

 

Its worth 10 cents.
That thing has seen better days my friend.

 

It must be true if you found it on the internet...

 

lol
reminds me of a comercial.

 

looks like it was submerged in water for a long time

 

I have found numerous clad coins that look just like your dime with my metal detector. Clad coins that spend enough time either buried in the soil or on top of the soil tarnish a dark color like yours.

 

any idea on worth?

 

Offhand I would say about ten cents.

 

Hobo has it right, that is exactly what ground found clad coins look like.