The Calibre 9 is wound, regulated and finished by a single watchmaker in a workshop with one window. Two hundred and eighty hours of reserve, and a rate you can read in a seismograph.
316L steel, 9.2 mm thin, 50 m water resistant.
Manual wind, 21 jewels, twin barrel, 280 h reserve.
Four hertz. The balance beats 8 times a second.
Per day, in five positions, over thirty days.
It is a twin-barrel movement, which means two mainsprings sit side by side rather than one behind the other. The result is a longer, flatter power curve: the watch holds its rate for five minutes when fully wound and still holds it on the last turn of the crown.
There is no rotor. A watch that has not been worn for two days will not have kept the time while it sat in a drawer, and a hand wound watch never pretends otherwise.
The bridge is finished by hand with a single tool called a black-polish steel: a flat tin charged with emery, worked in a figure-eight until the surface has no measurable reflection at all. It takes four hours and it cannot be undone.
Each movement is timed in six positions and on a rocking arm. The result is written on a card and signed, and the card is folded into the case with the watch.
Flat surfaces finished to a mirror that reflects nothing — the mark of a single hand working for hours.
Solid brass, cut with 96 teeth, polished on the flank so the oil sits where it is needed.
Synthetic corundum in the pivots. Harder than steel, and they hold oil for decades.