What stopped this coin from receiving CAC sticker?
I've been grading coins for 8 years now and I've learned to always assume that I missed something on the coin (spot, hairline, gouge, etc.) rather than the graders made a mistake. However, when I originally sent this coin to PCGS I thought it had a solid chance of 68+DCAM. Well it graded 68DCAM and I decided to not play the crack out/regrade game and just send to GreatCollections and have them send to CAC as I assumed it was a lock for the grade. It came back from CAC with "Not CAC" and to say I was surprised is an understatement. I know it's nearly impossible to grade proof coins from photo's but I have two questions. Do you see something that's holding this coin back from being CAC'd and do you think it's likely that CAC may have missed this one?
Here is the URL to the GC listing