Manual winding For many mechanical watch owners it is a pleasant ritual, a recurring moment: the hand-wound movement, which needs to be wound regularly using the crown. Doing this directs new energy to the mainspring barrel so that the timepiece keeps ticking.

The power reserve varies by model. In some cases, the watch may need to be wound every 36 hours, while other watches – such as the LANGE 31 – only every 31 days. To make such an enormous power reserve a reality, the model possesses a twin mainspring barrel housing two mainsprings with a length of 1,850 mm. The special winding key ensures a better gear ratio than when winding the crown by hand. Consequently only a few rotations of the hand are needed for the watch to be fully wound.

Technical drawing of the LANGE 31 winding key

2 Models 1815

3 Models 1815 "Homage to Walter Lange"

2 Models 1815 ANNUAL CALENDAR

4 Models 1815 CHRONOGRAPH

2 Models 1815 RATTRAPANTE PERPETUAL CALENDAR

1 Model 1815 RATTRAPANTE PERPETUAL CALENDAR HANDWERKSKUNST

2 Models 1815 TOURBILLON

1 Model 1815 TOURBILLON HANDWERKSKUNST

2 Models 1815 UP/DOWN

1 Model DATOGRAPH PERPETUAL

2 Models DATOGRAPH PERPETUAL TOURBILLON

2 Models DATOGRAPH UP/DOWN

1 Model DATOGRAPH UP/DOWN "Lumen"

1 Model DOUBLE SPLIT

1 Model GRAND COMPLICATION

3 Models GRAND LANGE 1

3 Models GRAND LANGE 1 MOON PHASE

1 Model GRAND LANGE 1 MOON PHASE "Lumen"

6 Models LANGE 1

3 Models LANGE 1 MOON PHASE

4 Models LANGE 1 TIME ZONE

1 Model LANGE 1 TOURBILLON HANDWERKSKUNST

1 Model LANGE 31

4 Models LITTLE LANGE 1

2 Models LITTLE LANGE 1 MOON PHASE

2 Models RICHARD LANGE

1 Model RICHARD LANGE "Pour le Mérite"

3 Models RICHARD LANGE JUMPING SECONDS

2 Models RICHARD LANGE PERPETUAL CALENDAR "Terraluna"

2 Models RICHARD LANGE TOURBILLON "Pour le Mérite"

1 Model RICHARD LANGE TOURBILLON "Pour le Mérite" HANDWERKSKUNST

7 Models SAXONIA

3 Models SAXONIA THIN

1 Model TOURBOGRAPH PERPETUAL "Pour le Mérite"

1 Model TRIPLE SPLIT

2 Models ZEITWERK

1 Model ZEITWERK DATE

1 Model ZEITWERK DECIMAL STRIKE HONEYGOLD

1 Model ZEITWERK HANDWERKSKUNST

1 Model ZEITWERK MINUTE REPEATER

2 Models ZEITWERK STRIKING TIME