Steel pennies were minted in 1943, not '42, and they're only worth around 5 cents.
In average circulated condition, a 1942 steel penny is worth around 10 to 25 cents, while a 1943 steel penny is worth about 15 to 30 cents. The 1943D and 1943S steel pennies are more valuable, ranging from 50 cents to a few dollars depending on their condition.
A 1942 copper penny is worth between $0.15 and $3.00. If you have a 1943 copper penny it is worth a lot more. In 1943 because of the war and the need for copper pennies in that year were made from steel. Steel pennies from 1943 are worth around $0.30 and $2.50. If you have a real 1943 copper penny take it to a coin shop or dealer and have them check it out to see if it is real.
The 1944 steel penny is valued highly because it was produced using leftover steel from World War II, as the U.S. Mint switched back to copper for the penny in that year. In contrast, the 1943 steel penny, made from zinc-coated steel to conserve copper during the war, is much more common, making it less valuable. The rarity and historical significance of the 1944 steel penny contribute to its higher market price, while the 1943 version is abundant and widely circulated.
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1 cent
There is no such thing.
All 1942 pennies are copper (it is the 1943 that is steel). It is a common date worth about 3 cents in average circulated condition and up to a few bucks if uncirculated.
Depending on condition, a circulated 1942 wheat penny is worth about $.20-$.40, it is worth more if it is uncirculated and about double the price if it has an "S" mintmark.
A 1942 Canadian half penny is worth $22000 - $50000.Canada does not make half cents. Also, their coins all have the word CANADA on them, so I'm betting you have a British half penny
Please see this link for prices
1942 is a very common date Lincoln cent with values of 2 to 10 cents for circulated coins
Not much, about 3-4 cents if circulated or a dollar or two in higher grade.