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Posted

Hello guys, brand new to the forum but have been following Mark on his YouTube channel for some time.  I have a old watch that i love that came with a 2836 with a GMT 24 hour hand on it.  Long story short i dropped it and wanted to repair it.  I had a parted out 2824 movement on hand that i would use for spares so to tore it done to see if I would have any luck.  Sadly the movement was too far gone and since it was a cheap Chinese clone i decided it was not worth repairing.  I good a good deal on a new ETA 2835-2 movement that has both the day and date feature and wanted to know if its possible to swap over some of the parts to the new movement and have it work with the GMT feature.

 

Thanks so much in advance.

Posted

Yes, it is indeed possible to use an ETA 2836-2, or 2834-2 movement, and transfer across the Chinese GMT parts to it, and have a functional GMT ETA Movement.

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    • Hi all, I've engaged here a couple of times over the years but never introduced myself. I've been restoring vintage timepieces for 15+ years and focus mostly on 1940s-1980s wristwatches. The farther gone it is, the more I enjoy bringing it back to life. Every now and then I come across something uncommon that I want to share that others my find interesting.  Or sometimes I come across a challenge that I haven't run into before, so I enjoy reaching out to others who I can learn from. Best, g2w
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    • 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/
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