A simple answer is: From 1793 to 1982. From 1983 to date the coins are zinc.
Copper pennies minted before 1982 weigh 3.11 grams.
No. It was 95% copper with 5% zinc and tin.
All pennies minted after 1982 are made of copper plated zinc.
All US cents minted for circulation since mid-1982 are 97.5% zinc, plated with 2.5% copper.
All Lincoln cents minted between 1909 and 1981 (except for 1943) have the same copper content: 95% copper with 5% zinc. The metal ratio was changed in 1982.
US cents minted since late 1982 are composed of a core of 99.2% zinc and 0.8% copper with a plating of pure copper.
All "copper" US cents minted from mid-1864 to 1942 and 1944 to mid-1982 were minted from an alloy of 95% copper and 5% tin and/or zinc. The coins weigh 3.11 gm when new so they contain 0.95 * 3.11 = 2.9545 gm of copper
The fewest general circulation Australian Pennies minted in any year are - 1930 Penny - 3,000 minted - It is widely considered that the release of this Penny was a mistake. 1925 Penny - 117,000 minted 1946 Penny - 363,000 minted 1931 Penny - 494,000 minted Beyond that, Pennies were minted in quantities from just under 1 million to over 54 million per year. British Pennies have been minted for well over 1,000 years, so we will stick with recent history. The fewest general circulation British Pennies minted in any year are - 1951 Penny - 120,000 minted 1848 Penny - 161,280 minted 1837 Penny - 174,720 minted 1844 Penny - 215,040 minted 1950 Penny - 240,000 minted 1849 Penny - 268,800 minted Beyond that, Pennies were minted in quantities from about 0.5 million to over 654 million per year. The fewest general circulation New Zealand Pennies minted in any year are - 1954 Penny - 1,080,000 minted 1941 Penny - 1,200,000 minted Beyond that, Pennies were minted in quantities from 2 million to 18 million per year.
A "D" means that the penny was minted in Denver An "S" means that the penny was minted in San Francisco (note - only proof cents are now minted there) A penny without a mint mark was minted in Philadelphia
Pennies minted before 1982, which includes all wheat pennies (except in 1943) contain 95% copper and weigh 3.11 grams.
The 1945 is worth a little more probably because there were less of them minted.
1943. There were a few leftovers minted in 1944, but no more than in the lower double digits