Japanese Seiko No. 5 rare 24-hour outer scale automatic mechanical watch, equipped with the original 7S26B 21-jewel self-winding movement. The transparent back cover fully displays the operation of the balance wheel gear, with outstanding mechanical texture. Clean pure white dial, the outer ring is surrounded by 13-24 o'clock military scale, the inner ring is an orbital minute scale, three-dimensional bar time scales are matched with full-coverage long-lasting luminous pointer scales, and the reading is clear in dark light environments.