This 1891 Indian Cent RB is a rare and highly sought-after coin among collectors of US coins. This particular coin is ungraded but has been assessed to be in MS63 or better condition, indicating that it is in excellent condition with only minor flaws visible under close examination. The RB designation refers to the coin's red and brown coloring, which is highly desirable among collectors. This coin is a true gem of American numismatics and would be a valuable addition to any serious coin collection.