Hint#4
time to narrow this down. with the previous clues this should put most folks in the ballpark
Hint#1 - the coin was minted in the 20th century and is a US Coin
Hint#2 - The coin contains more than 50% copper
Hint#3 - The coin has a plain edge
Hint#4 - The coin was struck at the Denver Mint between 1930 and 1950