Hitler's Third Reich issued these coins in aluminum. Starting in 1939 a swastika appears a the eagle's feet.
An aluminum coin dated 1944 with a G mint mark is rare, and worth $100 in average circulated, and $400 in fully uncirculated condition. Hope you have one of those!
For most of the other dates, approximate catalog values are given below:
worn: $3 US dollars approximate catalog value
average circulated: $8
well preserved: $18
fully uncirculated: $50
Several dates are worth more than the values above. The US dollar amount after the date and mintmark below is the approximate catalog value for a coin in average circulated condition:
1939D: $16 US dollars approximate catalog value average circulated
1939G, J: $23
1941G, J: $20
1942D, E: $20
Catalog values are inflated. Read about catalog values on our Important Terminology page.