Nope, not an error at all. 2.5 grams means that your coin is Copper plated over a Zinc core. 3.1 grams means it's Copper. Your coin is worth face value.
You're very welcome. Back in 1982, they still had some Copper Planchet left over from 1981, so they were using all of them up that year. They were also using a new composition, which was Zinc Planchets with Copper plating.
Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited. Contact Us | Advertise Here | Privacy Policy / Terms of Use