The Seiko 1F21-0B40 watch movement features a manual winding mechanism, 17 jewels for reduced friction and improved accuracy, a power reserve of approximately 40 hours, a frequency of 18,000 vibrations per hour for precise timekeeping, and a hacking seconds function for easy time synchronization. The movement measures 11.5 lignes in diameter, has a height of 4.5mm, and is designed to fit within a variety of watch cases. It also includes a date display function at 3 o'clock position.