Yep as Lee says above, that 1965 is the date of the first non silver U.S. quarters, dimes and halves. A big big thing to us. It causes our heart rates to raise as we begin to wipe the fresh dirt away from the just dug coin and see that 6 in the date. Just for a second or two we get a jolt!!! Looking for that next number to be anything below 5! That's where the fun is for me and most coin shooting detectorists. Looking for that next number. And of coarse its great if you get something lower than that 6 as well.
First thing I did when I looked at the picture of the quarter was blow it up and check the date. Congrats on your coin. May many more come. And some with lower numbers in the date.