Eric, Welcome to CT. As Tyler so tactful mentioned, we can't tell anything from your picture (sorry for the sarcasm Tyler). I'm assuming you think you have a 1965 quarter struck on a leftover 90% silver planchet from 1964. It's pretty unlikely that you found one as the are very rare, but you can easily tell by checking the weight. A silver planchet weighs 6.25 grams while a clad planchet from 1965 onward weighs 5.75 grams. Make sure you use a scale that read to at least 0.1 gram
Though I think they poster may be referring to the 64s (plural not MM) with the Reverse of 65 (the Types A, B & C) though we may never know unless the question is clarified and HQ pictures of Obv and Rev are posted. Semper Fidelis