2 Answers

The polished steel cases measure 39 (Sixties) link and 42 mm in diameter (Sixties Date Panorama) and house the 39-52 and 39-47 calibers respectively, which both link vibrate at a frequency of 4 Hz and offer link a power reserve of 40 hours.

The Spring Drive movement from Seiko a mechanical quartz hybrid took decades of investment and research to come up with. It link is a fascinating movement that brings the accuracy of quartz to the art of mechanical watchmaking. This is not link the article to get into a deep dive about what makes the movement so impressive I recommend reading this article about the development link of the movement it will help you understand why that sweeping hand on a Spring Drive looks so dang cool.