Description
Uni-directional automatic winding
Date setting by turning crown in opposite ways (position 2)
Time setting with crown in position 3
Instantaneous date change
- Overall diameter : 30.80 mm
- Casing-up diameter : 30.40 mm
- Overall height : 5.80 mm
- Height of winding stem : 3.00 mm
- Diameter of stem thread : S0.90 mm
Off-centre hours and minutes
Small seconds at 4:30
Large Date
Power-reserve indicator at 7h30
In-line lever escapement, 15-tooth wheel
Balance with 4 inertia weights
Flat Anachron microflamed spring
Mobile stud holder
Free-sprung balance
Nivatronic laser-welded to the collet
Pinned GE stud
Three-position crown
Slipping mainspring
Off-centre winding rotor
274 clockwise revolutions (without mainspring slipping) / 24 hours
21’600 Alt/H, 3Hz
Interia: 10.10 mgcm2
Angle of lift: 52°
12 h dial up : 280°
90 h dial up : 220°
160 ± 10 hours
37
High grade
Circular stripes on the bridges
Baseplate partly circular grained
Polished screw heads with chamfered slots
Pegs with polished rounded ends
Steelwork with polished chamfers
Movement: 257
Cased up with strap: 294
