Jump to content

Recommended Posts

Posted

Hi,

A customer brought me a watch to have a look at. It runs on a Zenith cal 650 movement and one bridge is damaged. I'm looking on ebay, cousins, but no results... Do you think there is any chance to get it? Can be used, can be brand new. Here's a photo, it's the one pointed.

 

 

zenith bridge 650.jpg

Posted

Ahhh... those donor movements are about €1000 so it’s rather not an option :(
The bridge is badly bent and there are some jewels missing, no idea how it happened, the customer bought it like this but probably didn’t know how hard it would be to bring it back to life.

Posted
3 hours ago, rafau said:

Ahhh... those donor movements are about €1000 so it’s rather not an option :(
The bridge is badly bent and there are some jewels missing, no idea how it happened, the customer bought it like this but probably didn’t know how hard it would be to bring it back to life.

For the bridge to be bent means it has had some very harsh treatment indeed. Replacing the jewels would be an option but not with a bent bridge. Sorry I have no other solution other than a donor movement.

  • Recently Browsing

    • No registered users viewing this page.
  • Topics

  • Posts

    • Good stuff, thanks!!!  I'm going to save it and re-read your post and watch the video again.  I have a few follow-up question:  My understanding is that the spring vibrates or breathes between the the two regulator pins. When the pins are fully open the effective spring length is from the stud and theoretically no rate adjustment can be made by moving the regulator arm. As the pins are closed the spring gets closer to one side of the regulator block but doesn't touch a pin. You can still move the regulator carrier the entire terminal curve without upsetting the coils.  The rate can now be adjusted using the regulator because the effective spring length can be modified.  My question is: Does the hairspring bounce off and touch one of the pins as it breathes? Is that why the effective hairspring length is adjusted by moving the regulator?  And follow-up: How is amplitude affected by the spring between the pins? Does fully open pins, dial up position = max amplitude?  When spring adjusted to 1/2 width still = max amplitude? When I have crown down gravity is pulling the spring against one of the pins and I would expect rate to go up and amplitude to go down. Is that correct?
    • A quick Google for Longines 25.17 found several similar watches - like this one with writing on the case back similar to yours https://benjaminmarcello.nl/product/longines-cal-25-17-tank-from-1938/
    • Apps like Watch Accuracy Meter can be inaccurate, and will read some watches better than others.  What daily rate does Watch Accuracy Meter give you if you check the Longines once it’s been running for 24 hours? Best Regards, Mark
    • Then, can I replace it by purchasing a regular ruby with the same or similar width and height and pivot groove size from eBay? If I replace it like the above and operate the movement, will there be no problem?
×
×
  • Create New...