Very loose machine. Proof coins are struck twice (and sometimes more on larger denominations) but the
Machine Doubling is common to see on the second strikes on proof coins. (Often the first strike
Machine Doubling is flattened by the second strike, creating flat field doubling) What does flat field doubling look like?










You often see this on the proof doubled dies, but is not part of the doubled die, but flatten
Machine Doubling on the first strike of the coin, then flattened on the second strike, leaving an appearance. But that is not what is on your coin. It is just
Machine Doubling at an low angle of light. (probably reflection on the image)
CoopHome:
What is flat field doubling? What causes it?