Specifically look at underneath the wings, the thickness of the letters on the reverse, and the leaves of the wreath. All that looks way off and doubled to me
Id like to tell you different, I see a worn quarter, perhaps you should tell me what you see? I did look at the pictures. get another quarter that is not worn and compare the two. I don't see what you see.
My personal opinion; if you are having trouble seeing the doubling on the known pictures, then it really isn't worth collecting. That tiny, barely split serif, absolutely minor doubling is not worth the time.
Check out these 1967 Quarters on Wexler's site. The doubling is very easy to see in his photos. http://www.doubleddie.com/1967437.html The split serifs can clearly be seen.