The Seiko W339-4A50 watch movement, measuring 28.00 mm in diameter and 4.40 mm in height, is a chronograph movement equipped with a big date and small seconds complication. It operates on a quartz mechanism and has a battery life of 54 months. The movement, manufactured in Switzerland, consists of 13 jewels with gilt finishing. Additionally, it features a 1/10-second chronograph function with 10-hour totalizer at the 6 o'clock position and a 30-minute totalizer at the 9 o'clock position. The small seconds subdial is positioned at 3 o'clock, while the day and month are displayed via hand at the 12 o'clock position.