Where was a U.S. coin bearing the letter "P" minted?

Jefferson Nickels
The Jefferson nickel was minted from 1938 through the present time. All of the nickels, except the "war nickels" were made of copper and nickel. In October of 1942 to 1945, nickel was removed from the coin and was used for the war effort. The nickels were made from copper, silver and manganese during this time. During the same time, there was a slight design change. The mint mark was increased in size and place above the dome, and nickels made at the Philadelphia mint had their mint mark "P" on them. In 1946 the P mint mark was removed again.
Starting in 1968, the mint mark was moved to the obverse side and is right after the date. Starting in 1980, the "P" mint mark was brought back.

Both the obverse and reverse were designed by Felix Schlag. In 1966, his initials FS were added below the bust. There were a few design changes in 1971, 1972, 1977 and 1982. It should be noted that 1944 nickels without a mint mark are counterfeit.

The Jefferson nickel was minted at three of the four current U.S. mints, Denver, Philadelphia, and San Francisco. The key dates for Jefferson Nickels are 1939 D, 1939 S, 1942 D, and 1950 D.

Composition:
1938 - 1942, 1946 to date 75% copper 25% nickel
1942 - 1945 56% copper, 35% silver
9% manganese
Weight:
5g
1942 -1945 .056256 oz. of pure silver
Diameter: 21.2mm
Edge: Plain


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