NOTICE: Read these instructions in whole. They will give you a good understanding of the operation of your NON DATE movement, and reduce any potential damage to the movements.

These instructions cover various calibres (movements). These are listed below:

  • NH38 – Open Heart
  • NH39 – Open Heart & 24-hour Sub Dial @ 10:30
  • NH70 – Skeleton Steel Finish
  • NH71 – Skeleton Gold Finish
  • NH72 – Skeleton Black Finish

Manual Operation of these movements are controlled from the crown, some may call this a winder. The crown has two operating positions that control the different functions of the varying Seiko movements covered in these instructions. Selecting the desired operating position is achieved by pulling the crown out gently. You should feel a click.

Hand-winding – Various Calibres

The first operating position of the calibres (movements) covered in these instructions is the hand winding function.

The first position is where your crown is at rest. This can vary depending on your watch’s design, but there are only two options with the watch customs we supply.

  1. You have a sports watch where the crown screws closed to create the water tight seal.
    The first position is found by unscrewing the crown until it is no longer engaged with the locking mechanism on the case.
  2. If your watch does not feature the screwed crown. The closed position (most pushed in) is the first operational position.

The first operational position is where you can hand-wind your watch. Essentially, this is putting power into the reserve. Approximately forty hand-winds of the crown in a clockwise rotation in this position will supply the reserve with a full supply. This will last approximately forty-one hours if unworn. If you intend to wear your watch every day, your watch will require no further winding as your movement will supply power through the autowinding mechanism.

Setting the Time & Hacking – Various Calibres

The second operating position of the varying Seiko movements covered in these instructions controls the hacking function by engaging this operating position. This position also allows the user to set the time.

The second and final operating position can be reached by pulling the crown out to the final position. You will notice when are in this position, as the second hand will stop moving. This is the hacking feature of your Cal.(movement) NHXX. The crown rotated in a clockwise position will move the hour and minute hands in a clockwise rotation. You should set the time by using the clockwise rotation for the bulk of the movement. It is understandable that you may miss the time that you wish to set your watch to. In this case, micro adjustments to the time in an anti-clockwise rotation are fine, but if you move over a few hours past, it is recommended that you continue the clockwise rotation until you achieve a full rotation.