Is this an error dime?

I have this dime and don't know what to make of it; its smaller than a regular dime and thinner and obviously missing the copper layer the edge is reeded is this an error? if so what kind?

 

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No. Environmental damage. Your coin was probably in the ground for awhile.

 

What date

 

Looks like a '64 from here

 

its a 65; how does environmental damage explain the size difference?

 

@paddyman98 What say you?

 

Erosion. Elements are a powerful force. All hills were mountains once.

 

Yes to Environmental Damage. I metal detect and have found many clad Dimes and Quarters with affected Clad Layers due to exposure to sand, soil, dirt, seawater, freshwater, weather. It can also affect the surface of Nickels.
Here are some examples of Quarters and Nickels -

 

BOOOO! for me; Thanks Guys

 

is that also the case for these 66, 67 halves?

 

I think there must be something more going on than just environmental damage. Simple environmental damage doesn't explain why it only weighs .7 g. It has lost two thirds of its weight.

 

Maybe scale needs calibration?

 

no my scale is correct.