1982 p half dollar gold colored

Was this struck on a dollar planchet it's gold colored rainbowish in the light it's a beautiful half dollar I just found

 

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A Sacagawea Dollar Planchet? It didn't even exist in 1982

They started in the year 2000
https://en.wikipedia.org/wiki/Sacagawea_dollar

 

I have found about 10 of these while CRH. Mine are gold plated clad coins. Somebody plated them after they left the mint.

 

For years, I used to search two $500 boxes of Kennedy halves each week. I would see a lot of coins from the 70's & 80's toned similar to this. I don't know if it was due to environmental or chemical conditions, but like @paddyman98 said, it certainly wasn't caused by the misuse of a dollar planchet because the golden dollar wasn't introduced until the year 2000.

Chris

 

I'm still peeking at this coin on the reverse side on the right wing is that a gauge?.