All US pennies made before 1982 are copper, along with some made in 1982 that are copper, however, copper-coated zinc pennies were also used during that year making identification by weighing necessary.
pennys
modern pennys are only copper coated
1950p272,686,3861950d334,950,0001950s118,505,000
Zinc covered in Copper
up to 1982
pennys are 97.5% zinc and 2.5% copper
And lots of other things. There are pipes in cars made with copper and quarters and dimes have copper inside of them. There are lots of other uses as well.
The answer depends on how many pennies are in each box.
There are no exact records of the number of copper pennies made in 1943. It was about 40. Most pennies that year were made of steel.
It depends on what year they were minted but from 1982 to date Lincoln cents are made from .975% zinc & .025% copper.
not very valuable, a pennys weight is worth a penny so it takes lots to make much money.
The switch was made in 1982. Some pennies that year are copper, and others are zinc. If you can't tell the difference, then use 1981 for the last year.