My guess is the OP is thinking of a 1982-D SMALL DATE "copper", which would be quite the find, but chances are it isn't one. A photo certainly wouldn't hurt, though. Edited to add: http://www.lincolncentresource.com/smalldates/1982.html
Uh huh. Dude blocks me for being too snarky to newbs and now he posts this. Seems it's getting to him a little too now.
In order to be important, your 1982D cent would have to: 1) be the bronze type and weigh 3.11 grams 2) have the small date that was intended for use on the later copper-plated zinc cents. The chances you have one like that are nearly zero. Where are you picking up this "half information"? I need to know.
"Houston, we have a picture!" Nope, OP, common large date 1982-D. One of "only" a little over 6 BILLLLLLION made, or about 20 of them for every man, woman and child in the country. Now, ... where are your other 19?
Nope, not even close. On a small date, the final "2" is still about a full digit-width away from the rim.
I wish, for the love of all that is holy, that this unicorn had never been found. The small date is a plague upon numismatics. I've seen at least a dozen threads claiming this coin had been found again. Every single 1982 D that is ever found by anyone that doesn't know anything is now going to be posted here. I curse whichever mint hack created this bastard. You do not have the super-rare, unique, one-of-a-kind, million dollar coin. Compare yours to the pictures of the known one. You don't have it.
We need to rid this field of this phrase, darn it! I know a guy who works at a local B&M coin shop and their policy is that if someone mentions the Internet, they basically stop caring what they say. Their motto is "only books matter". I'm starting to understand.
Only a dozen? I've probably seen fifty or sixty or even more. And so will every other 82 D large date copper cent. No one has questioned it being copper, but it IS the common large date, not the extremely rare small date.