====== RRM7309-C ====== **RRM7309-C** is a watch calibre by [[Ball Watch Company]]. It is an [[automatic]] mechanical movement, which is produced [[in-house]] and has [[chronometer]] precision. Complications are hours, minutes, sweep seconds and date. The [[power reserve]] is 80 hours. **Description:** * [[Self-winding]] movement, chronometer **Functions:** * Hours, minutes, sweep seconds and date **Data:** * Ø 34.24 mm, H 5.16 mm * 25 [[Jewels]] * 28,800 A/h {{tag>Movements Automatic_movements Ball_calibres}}