Error silver reverse quarter?

[Private]

Does this look like an error or just a really poor quality reverse quarter? 

[Just Bob]

From your picture, it appears to be something - a contaminant or damage done by a contaminant - on the surface of the coin, and not an error.

[Private]

It's the frost from the background not something on the surface. It looks like it was supposed to be polished and didn't get done very well. 

3 hours ago, Just Bob said:

From your picture, it appears to be something - a contaminant or damage done by a contaminant - on the surface of the coin, and not an error.

 

[Mohawk]

13 hours ago, Just Bob said:

From your picture, it appears to be something - a contaminant or damage done by a contaminant - on the surface of the coin, and not an error.

Agreed.  Someone in quality control at the San Francisco Mint was distracted or asleep at the switch.