So I had a tube with 28 quarters all 1965 all gem bu, rather than mess around with them I dumped them into a coinstar machine, out of the 28, 12 of them keep getting kicked back out for some reason. They are not silver. I tried a few different coinstar machines in the area, these 12 quarters always get rejected. Any thoughts on why? The weights are all right around 5.70 grams, the only thing I could find was that the circumference is .958 - .960" measured with a vernier caliper, in checking some normal quarters of the same vintage, I was getting .953 - .955", thats about the only difference I can tell.