Key specifications of the 2628.N movement: 

Caliber (movement diameter): 26 mm. 

Height (thickness): 4.75–4.93 mm. 

Number of ruby jewels: 17 or 19 (depending on the year of manufacture and model). 

Balance assembly: shock-absorbing (shock-protection device for the balance staff). 

Central seconds hand: yes. 

Functions: hours, minutes, seconds, dual calendar (displays the current date and day of the week). 

Calendar: instant or semi-instant. 

Power reserve: at least 40 hours from a single winding of the mainspring