The Seiko 1E20-6240 watch movement features a hand-wound mechanical movement with a power reserve of approximately 40 hours. It comprises 17 jewels, operates at a frequency of 21,600 vibrations per hour, and has a hacking function for precise time setting. The movement offers hours, minutes, and small seconds functionality, along with a date complication displayed at the 3 o'clock position. It measures 11.5 lignes in diameter and has a height of 4.0mm, making it suitable for a range of watch case sizes.