Any Ideas On This 1979 D LMC On A 3.4 Gram Planchette

It is a severely damaged coin.You can throw it back in circulation.

Cent struck on a rolled thick planchet and subsequently damaged post strike. It is an error but the damage negates pretty much any premium value it might have had.

Here's my only thing though this coin is gold colored and I mean like shiny bright gold 80's rapper chain gold. I've had several coin shops tell me that it's definitely not a copper or bronze coin and this came from my grandfather's collection and he had a friend that worked at the Denver mint that gifted this to him. I would have more to the info but my grandfather passed away a few years back and I was never able to talk to him about it. When I was given the coins from my grandmother the only info about this one in particular was about the fact it came from a friend who was a mint employee years ago. I know it probably doesn't matter but I was just curious as to if it may be a gold plated coin or perhaps it was on a different planchette. Its bigger than a normal Lincoln Cent more around a 10c euro piece.

The photos do not seem to indicate a bright gold color, but it does look like ithas had an acid cleaning at some time. And a word of caution, unless the coin shop dealer makes a regular market in error coins there is a verygood chance they know very little about error/variety coins except for the few well known and popular ones.

Lue 311, I've had several cents from the 70's that we're bright as gold. What causes this is simple, there was a little too much zinc in the copper mixture. The cause of this is a yellowed color copper cent. I have a few later cents that are made of copper plated zinc. The same rule applies to them as well. When too much zinc is left in the copper plating mixture you'll get a yellow colored copper plated zinc cent. That is what you have.

The Denver mint did not produce any foreign coins between the Liberian coinage ending in 1975 and the date your 1979-D cent was minted. No US mint produced blanks, planchets, or coins for any European nation between WW II and 2000.