The zinc one is 2.5 grams. The copper ones are 3.1 grams. They changed from copper to zinc in 1982. But that year they made both kinds. So there are a few 1983 and later years accidentally minted from left over copper planchets that were either laying around in a bin, or whatever and those are rare. In 1982 they made copper and zinc. BUT the 1982-D small date was only supposed to be made in zinc. A few were made on the old copper planchets. 1982 Philly large date zinc 1982 Philly large date copper 1982 Philly small date zinc 1982 Philly small date copper 1982 Denver large date zinc 1982 Denver large date copper 1982 Denver small date zinc (and the 1982-S proof I think large date) These sets can be put together from circulation, the most difficult ones to find in good condition are the Philly small date zinc and Denver small date zinc. They had problems with the new coins.
I am saddened when I read this. Because I remember when I was a teen in 82' - 83', we discovered this new cool trick with brand new pennies. We'd pick out the 82's, drop them on the ground and then with our tennis shoe, we'd drag the penny across the cement. The "trick" so to speak, was making the penny turn silver. Basically we scrapped off the thin copper coating to expose the zinc core. Yeah, you know teens, very easily amused with the simplest of things. But what saddens me about this is, I remember being disappointed when occasionally we'd do this to a 82' penny and it didn't turn silver because it was a solid copper 82', and now we come to realize that perhaps one of those could have been the infamous 1982 D small date copper penny.
Can't remember exactly but "Quotes and quotes and quotes, say Jameson how many quotes make a gallon?" Groucho Marx