1943 to save copper for the war effort.
1943
Steel pennies were only minted in 1943, however some examples of steel pennies being struck in error in 1944.
A total of 191,550,000 was minted in the U.S. of 1943s. How many are still around ? It is impossible to say.
The steel cent was produced in 1943, with a few minted into '44, but none were made in 1942.
No, though the mint did experiment with aluminum pennies in 1974, though all were either destroyed, donated to the Smithsonian, or stolen.
Well . . . there have never been any silver pennies minted in the US, so you must be talking about the steel pennies. As far as I know, 1943 was the only year that steel pennies, or 'steelies', were minted.
1943
Steel pennies were only minted in 1943, however some examples of steel pennies being struck in error in 1944.
The US never made steel pennies in 1946. They were made in 1943 to save copper for the war effort.
A total of 191,550,000 was minted in the U.S. of 1943s. How many are still around ? It is impossible to say.
The steel cent was produced in 1943, with a few minted into '44, but none were made in 1942.
No, though the mint did experiment with aluminum pennies in 1974, though all were either destroyed, donated to the Smithsonian, or stolen.
What specific Lincoln coins minted in the 1940's did you have in mind?
Steel pennies were minted in 1943, not '42, and they're only worth around 5 cents.
The materials used to mint pennies has changed. Originally, pennies were made of almost pure copper. Today, British pennies are made of nickel/steel blanks coated in copper, and US "pennies" (actually cents) are made of zinc blanks coated in copper.
Any Lincoln cent that does not have a mintmark was struck at the Philadelphia Mint
The US never made silver cents. In Britain, special silver pennies are minted for "Maundy money" sets but these aren't intended to be spent. All British Pennies minted prior to 1796 were made from silver. If you're referring to US cents, there's more information at the Related Question. Op may be referring to silver colored steel cent minted during WWII.