How Rare Is 1965 All Copper Quarter?

i can be either of the said suggestions I think it may be a penny planchet wich is why it is so thin . which I think might be more possible the clad panchet. Its is classified as I-E-2 (rarity level unknown) no value established. with clad layer missing is classified as an I-D-6 rarity level 5-6 worth $35. approx. but cant tell with out the weight an with out seeing it. worth holding on to but you most likely wont get rich

There is another option for the copper US 25 cent coin that I didn't see mentioned. In 1999, there were numerous reports of rolls of counterfeit copper quarters turning up in Southeastern Massachusetts. The reports made the newspapers because some of the coins were dipped in Mercury to make them look like nickel. The reports took the form of a "Hazardous" materials warning. They were being passed in various locations by an elderly couple as payment for meals etc. One roll seems to be the largest group passed. According to the reports I read they were well executed copies from transfer dies and were made to look worn to about VF - EF. They came in several dates but the forgers made the mistake of making an old style 1999 version. They apparently didn't know about the change to the State Quarter series. This error immediately called attention to their work and got the Secret Service involved. I never heard a followup saying they were apprehended. I also never heard a total number attached to this forgery operation. I mention this because the mercury would easily come off the forgery leaving a fairly clean struck copper coin with no evidence of their ever being a clad layer.