08/20/2026
This Omega Cal. 861 came in with a hammer that was in contact with both the seconds heart and the minute register heart. We only need it to contact the seconds heart as the minute jumper will take care of the minute register heart. This will ensure the seconds hand always returns to exactly zero each time.
It's hard to see with the bridge in the way so in the first diagram you can see both branches of the hammer are in contact and then a dotted line to denote how much metal needs to be removed. The second diagram shows the hammer now set up correctly. The videos demonstrate the before and after on the actual watch movement.