The Citizen 30-2520 watch movement is an American made mechanical movement with a diameter of 18 lignes. The movement features a balance wheel, pallet fork, and escape wheel that work together to regulate the timekeeping accuracy. It utilizes a stem winding mechanism for manual winding and a lever escapement for precise timekeeping. Additionally, the movement has shocks and jewels incorporated to enhance its durability and minimize friction. The Citizen 30-2520 movement does not include any other functions beyond those mentioned.