Manual Winding

Manual winding is not a limitation: it's a constructive choice that eliminates the rotor and everything that comes with it. Without the oscillating mass, the movement can be thinner, lighter, often more visible. The De Bethune DB2517 and the La Joux-Perret D100 and D101 calibers exist in the dimensions they have precisely because of this absence. The rotor, when present, takes up space and adds weight; removing it, however, requires a pact with whoever wears the watch.

The mechanism is simple in its logic: by turning the crown, energy is transmitted to the mainspring through a system of gears. When the spring is fully wound, you must stop. In modern movements there is almost always a safety mechanism against overcharging, but in vintage pieces — an AS1475 by A. Schild, an Excelsior Park EP40, a Seagull ST1901 — it is wise to proceed with caution. I have restored enough broken mainsprings to have learned prudence.

Frequency affects the winding experience. A caliber that beats at 2.5 Hz, like certain low-frequency movements from the German tradition, returns to the crown a different resistance compared to a modern 4 Hz. The slower beat is felt even under your fingers. It is not nostalgia: it is physics. The same applies to power reserve: a manual movement well proportioned to the barrel can reach 48, 60, even 80 hours. The Ressence Type 11 eliminated the crown by replacing it with a lever hinged on the caseback, solving the ergonomic problem without changing the principle.

In terms of finishing, the absence of the rotor exposes the bridges integrally. This is where makers invest: Armin Strom polishes and hand-finishes the bridges of the ASB19 caliber, Vacheron Constantin achieves ten different decorative techniques on the Calibre 978. It is not decoration for its own sake: when the movement is visible, every flaw is visible. Manual winding compels you to do things right.

The hack function — the seconds lock when the crown is pulled — is present in most contemporary manual calibers and in many restored ones. It allows synchronization to the second with an external reference. In vintage movements it is not guaranteed: verify before purchasing.