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Message:: [QUOTE="Clawcoins, post: 4231558, member: 77814"]Since the mint STOPPED using full copper based planchets in 1982,yes it would be, to say the least, "uncommon" for a 1991 cent to weigh 3.11 grams as it should weigh 2.5 grams as all copper plated, zinc core cents do (at least at some point in their lifetime). 1952 – 1982 is 95% Copper and 5% Tin & Zinc; 3.11 grams1982 – Current is 97.5% Zinc and 2.5% Copper; 2.5 grams One problem with the latest composition is it corrodes quickly.  That corrosion (and any other gunk) can add weight, although most of the time it gets light. Of course, you get other oddities of posters who claim their cent was struck on a canadian cent.  But 2014 -2020 Canadian cents .. that's another story. Also, we get many people who use the wrong type of scale to weigh their coin.  Jewelry scales are mandatory to 2 or 3 decimal places.Other food type scales round to the nearest whole number, which thus can be 1/2 gram off an actual weight (and also are not designed to be as accurate thus are off from that error rate too).  So 2.5g ends up 3g, 3.11g ends up 3g; 2.49g can end up 2g or 3g. And of course pictures are mandatory,and so is a picture of a weight measurement on a jewelry scale.[/QUOTE]