The information at coppercoins.com says the weight is the same as a normal cent for the year. Another site offers these years for sale: 1983,1985-D,1997,1997-D, and 1998. Don't know if these are the only dates known or not. Here's the link to the FAQ at coppercoins :
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