Speedmaster 3681 Chrono Stutter

Took my watch to the OB in Houston to get it serviced. The SA tried to wind it and couldn’t. Also the reset pusher no longer activates. It’s going to be repaired under warranty. They don’t have an estimate right now on how long it’ll be gone.

Sorry. Mine is also one of the first batch, I'll keep fingers crossed. On the bright side, if it has to happen, hopefully may be during warranty period.

https://streamable.com/ol1hy6?src=player-page-share

I'm joining this discussion because I’ve noticed the same issue described by the original poster on this particular Speedmaster 3861. I wanted to ask for your thoughts: this slight stuttering of the chronograph seconds hand - meaning a ticking motion that lacks smoothness - only appears when the watch is in a vertical position, as shown at the beginning of the video. It also only occurs between the 12 and 6 o’clock positions, as if gravity causes just enough additional play between the chronograph seconds gear train to result in this less fluid advancement. This behavior does not occur when the watch is held in other orientations, as seen in the second part of the video.

What do you think? Does this fall within the normal tolerance of the 3861 movement?

What happens if the face is upside down?

It runs smooth, as it does in every other rotation besides when it is vertical as per the video.

I meant vertical but with the 6 pointing upwards.

Yes, it runs smooth