Ha, ha! I actually had one of those but did not know that they existed nor knew their value. I found it by accident, because it looked different and kept it for a few years because it looked different. About ten years ago, I just spent it because I “knew” a 1965 quarter could not be 90% silver quarter. About three years ago, I found out how much they were worth.
Must have been a silver quarter stamped before LBJ stole all the good out of them