2000 Maryland quarter Either a die break or a foreign object stamped into it

This quarter has been mutilated. If you're lucky you'll get twenty five cents for it. BTW, die breaks are breaks in the die, into which the metal of the planchet flows. So the result of a die break would be a raised ridge, rising above the surface of the coin; not a deep ridge going into it. You have something entirely different going on here, and it has nothing to do with the original production process.