Helgray - Powered by the Time Module (Seiko) VK64 meca-quartz chronograph movement, the Silverstone Green is a timeless piece. https://www.helgray.com/collections/silverstone/products/silverstone-green #Silverstone #Green #Helgray | Facebook
Seiko Speedmaster 7A38-7010 Japan Meca-Quartz Mens Chronograph Watch | WatchCharts
What is a meca-quartz movement?
Inside The Seiko VK Mechaquartz Chronograph Movement, And A Bunch Of Cool Watches That Use It | by Curated Classics | Medium