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Ah, now those earlier push-to-set date movements are slightly different. I worked on an Omega Cal 752 which has the same type of date setting.
I can’t find a diagram of how the keyless works look for that movement, but in general, lack of “positive action” between the crown positions is usually down to a faulty “set lever spring” aka “bolt spring” aka lots of other names.....
On the attached diagram it is the “detent spring”. It is only accessible underneath the dial.
Not all keyless works are the same, but this is the most common design. On around 50% of second hand English-made Smiths, this spring is snapped!
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I’m not sure what exactly resonates. The seconds hand moves each time the pallet lever “beats” from side-to-side, so thy both move at the same time. Sometimes you can hear a “boing” which I wondered might be the balance spring, but you may have a point about the seconds hand. I guess the only way to know would be to remove it.
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I usually tighten very slightly at a time, and monitor for leakage. London water self-seals to some extent, but you’ll also find that expansion/contraction will affect the joint in use, so may need to re-tighten. As Airhead says, your olive could be worn out, but I often find that you can tighten a little further, presuming someone else hasn’t already done this.
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Those Speedmaster Reduced watches use a standard automatic movement with a chronograph module bolted on. That’s why the pushers don’t line up with the crown when you look at the side.
Nothing wrong with that, but they can be problematic to service, from what I’ve heard. If I were buying one, I’d want a bracelet and to be paying around the £1k mark.
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Can you punch the screws back in?