Just a beat up quarter. Once you learn how modern coins are manufactured, including the manufacturing process for dies, it will be much easier to recognize coins made from doubled dies.
Many collectors interested in the area of "die doubling" have trouble distinguishing the various forms of doubling from one another. This includes many forms not considered overly collectable or valuable. Many are "mechanical" in nature and originate during the striking or ejection of the coin while others are the result of die deterioration. They exhibit diagnostics completely different than "collectable" forms of "die doubling" created due to misalignments of images during their impressions into the die. The descriptions and images below should aid in your understanding of these differences.