Movement with manual winding, with an autonomy of 42 hours.

Functions: hours, minutes, central seconds.

Shape: round.

Diameter: 17.20mm [7'''3/4].

Thickness: 3.50mm.

Jewels: 17.

Balance: three arms, in gilt nickle.

Frequency: 28,800 pulsations/hour.

Balance-spring: flat, in Nivarox 2.

Anti-shock system: Incabloc.

Options: feature to stop the seconds, Etachron adjustment.

Derived calibers: 2671 [2660 with automatic winding, date]; 2678 [2671 with day of the week].