Just as I figured on your nicest looking coin. It is an EDS (Early Die State) coin. Note the EDS coin next to the dull one on the the bottom of image #3 and #4? See how the devices are different sized. So the coin in image #4 was polished down. While the devices on #3 are full and strong. Also the fields are very smooth. (just the way an EDS coin should look. So you have a normal coin in the earliest die state. That is why the coin looks so good.