Indeed .... 
With no disrespect intended ...... please allow me to clarify a little bit of the above reply .....
1942 nickels were minted in the 'traditional' 75% copper and 25% nickel composition at both the Philadelphia and Denver mints. These coins were minted using the normal mint-mark conventions ..... that is .... no mm on the Philly coins and a 'D' to the right of Monticello on the Denver coins.
War silver alloy 1942 coins were minted in Philly and San Francisco. These coins followed the new mint-mark convention of the large "P" or "S" above the dome.
Sooooooo ..... 4 total 1942 coins ..... by mint ...
San Francisco .... Only war silver alloy
Denver ..... Only Cu/Ni alloy
Philly .... both alloys .... and hence the Cu/Ni alloy is known as Type I and the War Silver alloy is known as Type II.
HTH
David
With no disrespect intended ...... please allow me to clarify a little bit of the above reply .....
1942 nickels were minted in the 'traditional' 75% copper and 25% nickel composition at both the Philadelphia and Denver mints. These coins were minted using the normal mint-mark conventions ..... that is .... no mm on the Philly coins and a 'D' to the right of Monticello on the Denver coins.
War silver alloy 1942 coins were minted in Philly and San Francisco. These coins followed the new mint-mark convention of the large "P" or "S" above the dome.
Sooooooo ..... 4 total 1942 coins ..... by mint ...
San Francisco .... Only war silver alloy
Denver ..... Only Cu/Ni alloy
Philly .... both alloys .... and hence the Cu/Ni alloy is known as Type I and the War Silver alloy is known as Type II.
HTH
David
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