Manual winding

Manual winding describes a mechanical watch wound only by turning the crown. There is no rotor and no automatic module, so the energy in the mainspring comes entirely from your fingers, and the watch stops when the reserve runs out unless you wind it again. It is the original arrangement, still chosen for dress watches, very thin watches and movements meant to be seen through the caseback.

Winding from the crown rather than with a separate key followed Adrien Philippe's keyless work of the 1840s, and every wristwatch was hand-wound until self-winding designs arrived in the 1920s and 1930s.

What turning the crown does

The chain is short, and every winding symptom sits along it. The crown turns the stem; the stem turns a clutch that, pushed in, engages the winding pinion; that drives the crown wheel, which drives the ratchet wheel screwed to the arbor at the center of the barrel. The mainspring is hooked to that arbor at its inner end and to the barrel wall at its outer end, so turning the arbor coils it tighter inside the drum. A click, a sprung pawl in the ratchet wheel teeth, stops it running backward, and that pawl passing over the teeth is the ratcheting you hear.

A full mainspring takes roughly six or seven turns of the barrel arbor, and the barrel then makes about one turn every six hours. How many crown turns that represents depends on the gearing between stem and arbor, which is why makers publish hours rather than turns.

How to wind one properly

Wind with the watch off the wrist if you can, holding the case rather than levering the crown sideways, which spares the stem and tube. If the crown screws down, unscrew it first and let it spring free. Turn it away from you in short half turns until you feel firm resistance, then stop. Depending on the caliber that is usually 20 to 40 turns from empty, but the count is a guide rather than a specification: the change in feel is the signal.

Wind once a day at roughly the same time, and if the watch has stopped, wind first and set second. The full procedure is in how to wind a manual watch.

The numbers

Power reserve is the specification that matters, and the spread is wide: long-reserve designs get further by combining a longer spring, a larger barrel and a slower beat.

Thinness is the other number. Removing the rotor and its gearing takes roughly a millimeter out of the movement, and it shows: Nomos publishes 6.2 mm of total height for the 35 mm Tangente, thinner than many quartz watches.

Why people choose them

A thinner movement sits closer to the wrist and slides under a cuff. The view through an exhibition caseback is unobstructed, since nothing spins over the bridges, and there is no rotor noise. For many owners the daily ritual is part of the point, which is an honest reason if not a technical one.

Rate and the torque curve

A mainspring does not deliver constant force. Torque is highest just after winding and falls as the spring uncoils, and the balance's amplitude falls with it. A movement that holds its rate across that range is isochronous, and none is perfectly so, which makes the last hours of a stated reserve the ragged end.

That is the real argument for winding daily rather than waiting for the watch to stop. Chronometer testing is carried out with the movements rewound every day, so a certificate describes behavior at the top of the torque curve. Winding once a day puts your watch in the condition the figures were measured in.

Common misconceptions

Overwinding is largely a myth in the sense people mean it. A healthy hand-wound watch simply stops accepting winding when the spring is fully coiled, because its outer end is anchored to the barrel wall. Damage happens when winding is forced past that stop, which can break the click, the spring's hook or the stem, so the rule is to stop at resistance rather than to test it. An automatic differs here: its outer end is a sliding bridle that slips when full.

A manual watch that has stopped is not broken, it is empty. Manual winding confers no accuracy advantage of its own, since an automatic worn daily often keeps a fuller barrel and a steadier rate. Nor is it more durable for having fewer parts: there is no rotor bearing to wear, but the stem and winding train are worked every day, and a worn stem or crown is among the more common bench jobs on a much-used hand-wound watch.

The reverse confusion matters too: some automatics cannot be wound by hand at all. Seiko's older 7S series has no winding pinion, so turning the crown does nothing and nothing is wrong.