Need help assessing a problem with a vintage seamaster

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Hello all,

It would be great if someone could help me out. I bought a vintage seamaster last week (cal. 565, ref.166.002). I’m having a problem with the seconds hand stopping occasionally. When it stops, it’s not stopping in a consistent location, or getting stuck on the other hands. I don’t think it’s getting stuck on the crystal, but I’m not positive. The watch was apparently serviced about a year ago, and has sat unworn since then. I don’t think that it’s a gear or anything getting binded up or anything either since the movement still keeps perfect time and continues to tick even when the seconds hand has stopped (I’ve held it up to my ear to hear it as well as observed the balance wheel still moving when the hand is stopped) as well as the fact that it was just serviced. Occasionally when it stops I will try tapping it or shaking it a little bit to see if that starts the hand again, and it starts up sometimes, but when it doesn’t start right back up, my shaking/tapping will occasionally move the seconds hand forward/backward by up to 15 seconds (usually only a few seconds though). This made me think that the seconds hand wasn’t seated properly on the post, but I removed the dial a few days ago to work on the date wheel and it continued doing it after I re-installed the hands. It’s possible it’s still not seated correctly, but what are the odds of it still being seated incorrectly after 2 installations? I’d love help addressing this issue, if anyone could help. I’d hate to have to return the watch, because I think it’s beautiful. I hope it isn’t a hard fix. I should add that I’m fairly comfortable with doing medium difficulty repairs. I don’t have tools or expertise to do a full service, but I can do some smaller work, for example, last week I took the autowinding works (to unwind the main spring), balance bridge, pallet bridge and fork, off of a cal.552 movement to get a hair out of the escape wheel. Thanks for any help!

 
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If the sweep hand is slipping, it may be as simple as tightening the tube slightly. But unless you're very comfortable with your diagnosis, I'd suggest having a watchmaker inspect it.

Given how much you've been tampering with the watch, I'd say it's far too late to return it. That ship has sailed.

BTW, the photo is very small, but there are some things about the dial that are looking odd to me. Perhaps you'd care to post a better photo.
Edited:
 
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I’d hate to have to return the watch,
but I removed the dial a few days ago to work on the date wheel
Good luck with a return if you've worked on the watch.

As to the seconds hand.
Every time a hand is removed and re-fitted, the pipe become a little more enlarged, sometimes so much so that it will be loose on the post.
It can be corrected using various tools so you could try that first.
 
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The image is of a distressed cal. 565 with the automatic winding assembly removed. This movement has an idler pinion to carry the seconds hand. That idler pinion is driven by the time train third wheel. That idler pinion has no mainspring torque on it as it is an idler. It is subject to the kind of “stuttering” that you are seeing. To alleviate this stuttering, a thin brass tension spring is fitted, the tip contacting the pinion that drives the seconds hand. The white arrow in the image points at that spring. It is held in place by a very tiny screw which must be removed, tension added to the spring, then the spring refitted. To access this area, the auto wind assembly will have to be removed. You sure you’re gonna try this yourself? P S: you may or may not alleviate the stuttering. It is symptomatic of indirect drive pinions.

 
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Given how much you've been tampering with the watch, I'd say it's far too late to return it. That ship has sailed
Yeah, you’re right. That was dumb of me, I’m not really sure why I said that.
BTW, the photo is very small, but there are some things about the dial that are looking odd to me. Perhaps you'd care to post a better photo.
I can post another picture later. Do you think I got screwed? It was hard to tell from the eBay listing photos, but when I got the watch, the crosshairs don’t look that well lined up. I don’t mind redials all that much if they’re done well, but I’d obviously prefer an original dial.
 
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you may or may not alleviate the stuttering
A short video that explains the issue described above:
Yep, I discounted a pinion spring though as soon as I saw that the hand moved
forward/backward by up to 15 seconds
 
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You can also check the pinion to see if it is original? I have encountered this situation