In 1963, barely 20 years after the surrender of the Japanese in World War II, the K. Hattori & Co., Ltd. released an iconic watch that was way ahead of its time.
The watch was the Seiko Sportsmatic 5 and it had a movement with an unbreakable mainspring. It was also shock resistant. Until then, this was unheard of outside of Swiss watches. Furthermore, the watch had a water resistant case and a day-date complication. More importantly, it had a reliable and accurate self-winding movement that withstood everyday use.