This 1944 thick planchet specimen is more likely a mint error struck on either a foreign planchet, or on misrolled stock, ie cent planchets of either 5 cent nickel or quarter thickness. For more on this, we recommend Mike Diamond's article for Coin World published on July 14, 2014, and titled "Scrutinize claims of experimental planchets, test strikes".
To our knowledge, no analysis has been performed to see if these were struck in a special alloy. Because of this, we do not list this coin in our
Thick planchet specimens are also known for 1941, 1942 and 1945 and many other dates.
It is unclear whether examples listed as being struck in brass or other compositions are also mint errors or some kind of wartime experiment. Further research needs to be performed with regard to these pieces.
Photo courtesy of Heritage.