True. I just wanted the OP to be sure of the date and the weight. It would be cool if he has it correct.
Our story begins in 1982, when the alloy of the cents was changed from 95% copper to approximately 95% zinc. All cents minted subsequently to the change contained approximately 95% zinc. However, since 1982 was a transitional year, the possibility existed that some leftover copper planchets could have been used inadvertently to strike 1983 coins. Apparently some 1983 pennies are being found that were made from copper.
Some 1983 coppers have been found and sold for very high amounts. I believe in a case like that, when the population increases, the prices will fall. Not trying to be a skeptic, but what is to prevent this person from putting the "TARE" on his scale at +0.6g and showing us a 2.5g zinc that reads 3.1?
"Our story begins in 1982, when the alloy of the cents was changed from 95% copper to approximately 95% zinc. All cents minted subsequently to the change contained approximately 95% zinc. However, since 1982 was a transitional year, the possibility existed that some leftover copper planchets could have been used inadvertently to strike 1983 coins." ~ from the PCGS Library
If the coin is an undamaged 1983 D and the weight is correct he really lucked out. Most of these I have seen turn out to be BU (Beat-Up) and the date is unclear. in other words, an '82 or an '80 that took a hit and looks like an '83.
Sure... unless demand kept them high, it makes sense prices would fall, but finding one would still allow for one hell of a return no matter what. And I suppose there isn't anything preventing the OP (or anyone else for that matter) from doing as you said, but why? No offense towards the OP intended, but something tells me that the same guy who is having great difficulty taking a basic photo probably hasn't gone through to comparatively great trouble of buying a scale (as opposed to using one at the post office) just to "troll" us. And even if he did, we've the PlanMan here to call him (and everyone else) on it.
Perhaps it's because you're a good dude? The fact is too many come down too hard on questions like this (IMO), failing to realize (or perhaps accept) that not a single one of us was any different at one point in time. I'll never understand why some are so quick to tear into the new while other more established members, spewing questionable to potentially harmful misinformation, get a pass. It's very unfortunate.