about 1800 The French Jacobin Convention introduced a new decimal calendar in 1793, with 12 months of 30 days plus 5 'holidays'. Each day would have 10 hours, each 'hour' 100 minutes and each 'minute' 100 seconds. This dial shows both decimal (10) and duo-decimal (12) hours. Jean Chambon, Paris Fusee, verge escapement, balance with spring (P&E CAI-814)
aperture=f2.8 focal length: 60.0 mm exposure 1/100 sec ISO: 3200