Well there is one that is a proof that is from Philadelphia since 1980 that has a 'P' mintmark on it.

All pre 1965 proof coins do not have a 'P' mintmark that were proof nickels. (The War years did have P Mintmarks on them as mentioned above, but they were not proofs. But they were business strike nickels. (Type Two Nickels) 1909-1916 had the matte proof coins. No more until 1936 when they started the proof sets back up again. 1936-1942 1950-1964. After that most of the Proof coins were made in San Francisco. The one I mentioned from Philly and the others from West Point.
Satin finish on some coins as well:
Cents:
The 1965-1967 SMS were also in all denominations, but there were no mintmarks on these.
2005-2008 Plain and Denver:
https://www.PCGS.com/cert/40591479https://www.PCGS.com/cert/30843862Higher grade examples only in BU. (MS-69, MS-70
Quote:quote from PCGS on the Cents: Jaime Hernandez:
From 2005-2012 the Mint produced Special Satin Finish Mint Sets. Each Mint Set contained an example of every circulating coin in a specially struck burnished planchet. For the
Lincoln Cent this was also the last year in which the Mint used the
Memorial cent design.
Most 2008-D Satin Finish Lincoln cents were struck very well, with many examples grading MS67 and higher. Coins in MS68 are a bit difficult to find but yet, still available. In MS69, they become more difficult with possibly a few hundred examples that grade MS69.
Nickels:
The 1965-1967 SMS were also in all denominations, but there were no mintmarks on these.
SMS 1997-P:
https://www.PCGS.com/cert/05410176https://images.PCGS.com/CoinFacts/1...080_2200.jpg
But note the strike on this coin. They are EDS examples in MS-69 and MS-70 high grades.
Your coin is not one of these. Note the die flow lines on your coin. These don't have that.
Also on the 2005- 2010 P and D. There were Satin Nickels:
https://www.PCGS.com/cert/73714417https://images.PCGS.com/CoinFacts/7...876_2200.jpg
These are the Satin Finish examples. Again note the totally clear fields and freshest die state for these. Also High grade only examples.
https://www.PCGS.com/cert/83251506https://www.PCGS.com/coinfacts/coin...mages/418794Dimes:
The 1965-1967 SMS were also in all denominations, but there were no mintmarks on these.
Same 2005-2010 Satin Finish:

Quarters:
The 1965-1967 SMS were also in all denominations, but there were no mintmarks on these.
2005-2008 P and D Satin finish:
https://www.PCGS.com/cert/37288062https://images.PCGS.com/CoinFacts/3...052_2200.jpg
https://www.PCGS.com/cert/37288139Although the information on this area doesn't call this a satin finish, I feel PCGS just forgot to add that information. The coin clearly is a satin finish coin.https://images.PCGS.com/CoinFacts/3...339_2200.jpg
Halves:
The 1965-1967 SMS were also in all denominations, but there were no mintmarks on these.
2005-2010 P and D examples:
https://www.PCGS.com/cert/73685756https://images.PCGS.com/CoinFacts/7...646_2200.jpg
https://www.PCGS.com/cert/18115054https://images.PCGS.com/CoinFacts/1...342_2200.jpg
Sacagawea dollar: 2005-2008 P and D mint. Also in higher grades and in the flawless fields. (
not the normal circulation coins)
https://www.PCGS.com/cert/40748366https://images.PCGS.com/CoinFacts/4...350_2200.jpg
https://www.PCGS.com/cert/20275865https://images.PCGS.com/CoinFacts/2...357_2200.jpg
Presidential dollars 2007-2010 (Washington to Lincoln) P and D Satin Finish:
https://www.PCGS.com/cert/03891178https://images.PCGS.com/CoinFacts/0...883_2200.jpghttps://www.PCGS.com/cert/13381612
CoopHome:
Digging deeper into the coin information off PCGS coin facts information and images. (Expanding horizons)