Looks like coin contact. Note the affected area is showing striation lines. That is from another coin hitting it. It can't be feeder finger lines? Why?
Feeder Finger Damage affects the fields, not the tops of the devices. The highest areas on the design are most often hit with contact damage in circulation.
CoopHome:
What areas will you find damage from Feeder Finger Damage? the fields are the first areas affected, then the bottoms of the devices will be affected next. the tops usually are not affected with FFD. dies are just opposite of coins.