Nickel was a critical material for armaments during World War II. Regular Jefferson nickels were replaced with silver-alloy types from 1942 to 1945. To distinguish these coins from regular issues, large mintmarks appeared above the Monticello dome on the reverse. The letter P was used for the first time on these Philadelphia nickels (normally coins produced in Philadelphia carry no mintmark at all). Significantly more Jefferson nickels were produced in Philadelphia the previous year. Brilliant Uncirculated quality.