One cent.
A 1942 US Wheat cent is common, average value is 3 cents.
Sorry no US 2 cent coins dated 1863
The 1942 Lincoln cent is a very common coin. Most are only 3 to 10 cents.
Check that coin again. The last year for silver 5-cent pieces (half dimes) in the U.S. was 1873. Then the only nickels to contain silver are dated 1942-1945 (war nickels).
The US did not mint any half dollars dated 1800.
Sorry no US 20 cent coins dated 1802
5 cents
The value of a 1942 one cent Lincoln American coin can vary depending on the mint, the condition, and the rarity of the coin. For an exact value, a person should have the coin graded by a professional.
Check that coin again. There's no such thing as a 1942 steel cent.
Sorry, no US 5 cent coins exist dated 1815
Unless your coin is of some collector value, which would need to be assessed by a coin dealer, a 1942 canadian coin is actually worth more for its silver content value than the 25 cent face value. Your coin contains 80% silver which, at today's prices, is worth approx $2.90 in silver value. The related link below will calculate the value with current silver prices.
The last US half cents were dated 1857.