1976-D Bicentennial Coin error Weighs 11.57g

Hi, Thank you in advance for any help. I have been weighing my Half dollars for a long time looking for a 40% clad error when i came across this bicentennial weighing in at 11.57 grams. My scale is perfectly calibrated as i had just weighed about 50+ clads before hand. They all weighed in anywhere from 11.19-11.36 grams. This one does not appear to be silver from the edge as i have compared it to other 40%'s i have and it is too dark. The coin is clean and no signs of it being a magic coin or counterfeit. Any input would be very helpful! Thanks again guys! -

 

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Definitely Clad..
Struck on thicker than normal Planchet?

 

Well within Tolerance

 

Kennedy's fat years.

 

Thank you for all the responses, upon further investigation the mint has a tolerance of +/- .454g for clad at 11.34g average. So this is in fact just a fatty

 

lol

 

Thank you for this