WELWYN WATCHES
  • Home
  • Blog - " At the Bench "
  • Videos / Photos / Reviews
    • Product Reviews >
      • Blu Shark Strap Review
      • Nordgreen Philosopher
      • Nove Craftsman Watch Review
      • SELHOR Diver 05 Review
      • Selhor Chronograph Rallye
    • Photo Gallery
    • Watch Bites >
      • Seiko 6119 Restoration
      • Seiko Ladies Diamatic
      • Seiko 6309 NOS
      • Seiko Lord Matic 5606A
      • Vintage Cyma PW
      • Omega 26.5 SOB T1
      • Junghans Chronometer
      • Record German Military WWII
      • Rolex/Tudor Princess
      • Omega Seamaster Cosmic 2000
      • Rotary 2824 - Limited
      • Rotary - Red Diamond
      • Universal Geneve - Cal 500
      • Montine Swiss - Mint
  • Shop / Info / Guides
    • Watches For Sale
  • News/Info/Websites
    • Websites/Suppliers Of Interest
    • Movement Identification
    • Dial Restorations
    • Identifying Parts
    • Movement Markings ID
    • Canon Pinion Removal Tool/s
    • Downloads
  • Contact
    • Services & Pricing

At The Bench

Follow current watch repairs/restorations

Longines L650.2 - Dubois Depraz Chrono

5/27/2018

0 Comments

 
Picture

​In the workshop this month is this Longines Conquest chronograph featuring a Dubois Depraz Chrono module. Sent in after having stopped it was time to finally service this watch and get it back in running order, having removed the back it was visible the hack had somehow come out of its place and was stopping the balance.

Picture

With the back off it is clear the casing needs a clean to get rid of the debris that has built up. Dirt/Debris and fine movements do not play well together so an ultrasonic clean should remove this problem. This watch is front loaded so the front bezel will have to come off to release the movement.
​
Picture

With the movement now free we can remove the dial and hands and take a look at the movement and the module that sits on top which comprises the clever chronograph assembly.

Picture

Unlike other chronographs the module design used here is very clever, by using the power of the main movement to power the module you can service the main movement separately without needing to disassemble the whole watch. The module is designed by the famous Dubois Depraz and it sits neatly on top of the main movement ( ETA 2894-2 ), this is just one module design of the many specialist designs produced by Dubois Depraz. A large amount of popular Swiss brands turn to Dubois Depraz for their chronograph needs ( including Rolex ), no doubt this in turn saves a lot of headaches and money in r&d, why build something from scratch when there are specialists who can do it for you :)
​
Picture

The module above is secured in place by three screws and simply lifts off the main movement, no fuss or special tools just lifts right off. The beauty of this design is that you don't actually have to remove the dial & hands as the whole unit is not directly connected to the main movement ( the train wheels etc ). Instead communication is via small transmission wheels which pass the required ratios through intermediate gears. However in this case the date wheel is out of sync so adjustments must be made to the upper chrono module. The module itself is not serviced and instead it is recommended to be replaced outright ( at rather large cost ), however this module is in pretty good shape so not much needs doing here.
​
Picture

Stripping down the main movement can be done just like any other ETA 289X movement, simple and straightforward unlike other chronographs. Only a few photos taken below as this is going over old ground.


With the movement cleaned, assembled and lubricated it was then tested for several days for timing before being finally adjusted and then recased. The casing had gone through the ultrasonic removing all the gunk and debris and even bringing back some sparkle to the diamonds around the bezel, the glass was also given a light polish to remove the scratches and make the dial more visible.
​
Picture
Movement fully assembled
Picture
Dial fastened in place
Picture
Hands fitted :)
Picture
Front loading case design
Picture
Secured in the casing

Ladies watches are often thought of as small little things that our grandma might wear so its refreshing to see a nicely sized piece with all the bells and whistles :) A lovely watch returned to good running order and no doubt a happy customer :)

Picture
Picture

More blogs to come but bare with me as it has become busy season and time is limited :)
​
0 Comments

Your comment will be posted after it is approved.


Leave a Reply.

    Author

    Hertfordshire based watch restorer. Follow my blog for new watches under restoration/repair

    Archives

    October 2019
    August 2019
    April 2019
    December 2018
    November 2018
    October 2018
    September 2018
    July 2018
    May 2018
    March 2018
    February 2018
    January 2018
    November 2017
    October 2017
    September 2017
    July 2017
    June 2017
    May 2017
    March 2017
    February 2017
    January 2017
    December 2016
    November 2016
    October 2016
    September 2016
    August 2016
    July 2016

    Categories

    All
    English
    Japanese
    Swiss

    RSS Feed


Contact Email

welwynwatches@gmail.com
  • Home
  • Blog - " At the Bench "
  • Videos / Photos / Reviews
    • Product Reviews >
      • Blu Shark Strap Review
      • Nordgreen Philosopher
      • Nove Craftsman Watch Review
      • SELHOR Diver 05 Review
      • Selhor Chronograph Rallye
    • Photo Gallery
    • Watch Bites >
      • Seiko 6119 Restoration
      • Seiko Ladies Diamatic
      • Seiko 6309 NOS
      • Seiko Lord Matic 5606A
      • Vintage Cyma PW
      • Omega 26.5 SOB T1
      • Junghans Chronometer
      • Record German Military WWII
      • Rolex/Tudor Princess
      • Omega Seamaster Cosmic 2000
      • Rotary 2824 - Limited
      • Rotary - Red Diamond
      • Universal Geneve - Cal 500
      • Montine Swiss - Mint
  • Shop / Info / Guides
    • Watches For Sale
  • News/Info/Websites
    • Websites/Suppliers Of Interest
    • Movement Identification
    • Dial Restorations
    • Identifying Parts
    • Movement Markings ID
    • Canon Pinion Removal Tool/s
    • Downloads
  • Contact
    • Services & Pricing