Specifications and Construction: Caliber: 24 mm. 

Height (thickness): 6.85 mm. 

Number of jewels: 27 ruby jewels. 

Functions: hours, minutes, central seconds hand, instant or dual calendar (date and day of the week in a horizontal window). Automatic winding: bidirectional with a sector on a bearing (or a clutch system). 

Balance: screwless with a shock-absorbing balance staff.