Seiko 5R66

The Seiko 5R66 is a Spring Drive quartz movement manufactured in Japan. It maintains an accuracy of ±15 seconds per month and features a 72-hour power reserve with 30 jewels. The movement includes a power reserve indicator and hacking seconds function. Its most distinctive characteristic is the smooth "Glide-Motion" sweep of the second hand, a signature of Spring Drive technology. The caliber is used primarily in Seiko's Presage collection.