1988P Dime

What can cause this or is this a true error?

 

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Contact with a corrosive substance will give that effect.

 

That would make it smaller than other dimes?

 

ive got a 56 wheat penny that is paper thin and only weighs 1.1 grams been told it is from being in water a very long time even though there is visible detail on both sides

 

Hi Mountain girl, and Jeffery , both of the situations are same cause. Both of the coins are approx. 90 % copper with usually zinc making up Zinc and occasionally some other cheap metals make the rest. Both Copper and Zinc react rather fast and actively with ionized water. If reactive metal coins are put into a drink holder and soda overflows, in a few months they will be nasty . Yeagh, I do it sometimes, but my vehicles are very old.
Jim

 

Yup, acid/environmental damage

 

Definitely damaged

 

Yes.. not a mint error of any kind.
Just a corroded Dime.

 

Acid damage.

Suggestion. Always start a separate unique thread. And you need to post pictures!

Welcome to Cointalk

 

The coin material dissolves away because of the chemical(s). Basically the same with how ice cubes dissolve from warmer temps and get smaller.