Looks like Environmental Damage to the Clad Layer of your Quarter. Not a Mint Error By the way.. Coins are struck not printed. Paper Currency is printed. So it's not a Misprint.
Lola# wow! You are so wrong since the quarter is if capped it has two eyes and two noses so you want to see a weathered quarter here is a 1965 silver quarter that had been weathered I have been collecting coins for over thirty years so thank you! And that what called weathered in front of his face it days liberty. So tell me another one