2013 Fort Mchenry Quarter Error?

On incuse devices, coin contact can affect these devices. It makes if look like something is going behind them, when actually the contact is affecting the outer edge of the coin.



Hub doubling on incuse devices do the opposite. Hub doubling on incuse devices actually reduce the size of the devices.



So on the dates and other devices on these quarters with the incuse devices, if the doubling is enlarged, it is actually machine damaged during the strike.


The devices on the Parks quarters that make the incuse design are raised above the die (positive on a negative die) and the coin will have an incuse design on a positive coin. (incuse on a positive design) I know this sounds confusing, but when the dies move during the strike it enlarges the design. (machine doubled from die movement damage) I wish I have better examples to show. But they will eventually turn up with all these quarters out there.

So on raised devices:
If the design is reducing the size of the devices, it is machine damaged (doubled).
If the devices are enlarged, then it is hub doubling.

On incuse devices:
If the design is reducing the size of the devices, it is hub doubling.
If the devices are enlarged, then it is machine damaged (doubling).

Movement during the strike affects the devices differently.
Contact during circulation affect them differently.

Thank you both of you . The second article is a good one it explains exactly what I'm looking at

Are you referring to the doubling of the "013" in 2013? In the second picture I can see the doubling of the "0" good and at the top of the "1" and the "3". I believe this to be Machine Doubling. Because the date is incuse Machine Doubling looks a lot different then if the numbers were raised.