It was minted in Philadelphia.
Philadelphia quarters dated 1979 and earlier do not have a mint mark.
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i have a quarter with no back on it no date with a P
If it has no mint mark or a letter P, it's minted in Philadelphia. If it has a D, it's from Denver.
On the reverse of the quarter eagle, the eagle is sitting on a bundle of arrows. To the left of the arrows there will be a "D" which means you have a 1911 D quarter eagle, the key date. If there is no letter "D" to the left of the arrows, you have just a 1911 quarter eagle (occasionally called a 1911-P because it was struck in Philadelphia, however it doesn't have a P mintmark).
I assume you mean it has no mint mark. Remember, Philadelphia coins did not use the P mint mark until 1980 (except for wartime 5¢ pieces) so your coin is an ordinary circulation issue worth face value only.
The forth quarter of the phases oh the moon