The direction in which an automatic watch winding box (watch winder) should rotate—clockwise, counterclockwise, or bidirectional—depends on the specific winding mechanism of your watch.

1. Some automatic watches wind efficiently only when rotated clockwise, while others require counterclockwise rotation to wind properly. Using the correct direction prevents underwinding and protects the watch's internal mechanisms.
2. Many modern automatic watches are designed to wind in both directions, so a bidirectional winder that alternates between clockwise and counterclockwise rotation is often ideal. This mimics natural wrist movement and ensures comprehensive winding without uneven wear.
3. If unsure about your watch's preferred winding direction, you can test by setting the winder to rotate clockwise only and observe if the watch keeps accurate time after a couple of days. If not, try counterclockwise rotation. This trial helps identify the correct setting when manufacturer specifications are unavailable.
4. High-quality watch winders typically offer settings for clockwise, counterclockwise, and bidirectional rotation, allowing you to customize the winding direction according to your watch's needs.

In summary, there is no universal answer; the correct winding direction depends on your watch model. Using a watch winder that supports all three options and selecting the appropriate direction based on your watch’s specifications or testing is the best approach to maintain optimal performance and longevity.